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From jsto...@apache.org
Subject svn commit: r1811008 [37/43] - in /nifi/site/trunk/docs: ./ nifi-docs/ nifi-docs/components/ nifi-docs/components/org.apache.nifi/ nifi-docs/components/org.apache.nifi/nifi-ambari-nar/ nifi-docs/components/org.apache.nifi/nifi-ambari-nar/1.4.0/ nifi-do...
Date Tue, 03 Oct 2017 13:30:27 GMT
Added: nifi/site/trunk/docs/nifi-docs/html/record-path-guide.html
URL: http://svn.apache.org/viewvc/nifi/site/trunk/docs/nifi-docs/html/record-path-guide.html?rev=1811008&view=auto
==============================================================================
--- nifi/site/trunk/docs/nifi-docs/html/record-path-guide.html (added)
+++ nifi/site/trunk/docs/nifi-docs/html/record-path-guide.html Tue Oct  3 13:30:16 2017
@@ -0,0 +1,1468 @@
+<!--
+                        Licensed to the Apache Software Foundation (ASF) under one or more
+                        contributor license agreements.  See the NOTICE file distributed with
+                        this work for additional information regarding copyright ownership.
+                        The ASF licenses this file to You under the Apache License, Version 2.0
+                        (the "License"); you may not use this file except in compliance with
+                        the License.  You may obtain a copy of the License at
+
+                        http://www.apache.org/licenses/LICENSE-2.0
+
+                        Unless required by applicable law or agreed to in writing, software
+                        distributed under the License is distributed on an "AS IS" BASIS,
+                        WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+                        See the License for the specific language governing permissions and
+                        limitations under the License.
+                        -->
+                        <!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="UTF-8">
+<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<meta name="generator" content="Asciidoctor 1.5.2">
+<meta name="author" content="Apache NiFi Team">
+<title>Apache NiFi RecordPath Guide</title>
+<style>
+/* Asciidoctor default stylesheet | MIT License | http://asciidoctor.org */
+/* Copyright (C) 2012-2015 Dan Allen, Ryan Waldron and the Asciidoctor Project
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+</head>
+<body class="article">
+<div id="header">
+<h1>Apache NiFi RecordPath Guide</h1>
+<div class="details">
+<span id="author" class="author">Apache NiFi Team</span><br>
+<span id="email" class="email"><a href="mailto:dev@nifi.apache.org">dev@nifi.apache.org</a></span><br>
+</div>
+<div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+<ul class="sectlevel1">
+<li><a href="record-path-guide.html#overview">Overview</a></li>
+<li><a href="record-path-guide.html#structure">Structure of a RecordPath</a></li>
+<li><a href="record-path-guide.html#child">Child Operator</a></li>
+<li><a href="record-path-guide.html#descendant">Descendant Operator</a></li>
+<li><a href="record-path-guide.html#filters">Filters</a></li>
+<li><a href="record-path-guide.html#function_usage">Function Usage</a>
+<ul class="sectlevel2">
+<li><a href="record-path-guide.html#arrays">Arrays</a></li>
+<li><a href="record-path-guide.html#maps">Maps</a></li>
+<li><a href="record-path-guide.html#predicates">Predicates</a></li>
+</ul>
+</li>
+<li><a href="record-path-guide.html#functions">Functions</a></li>
+<li><a href="record-path-guide.html#standalone_functions">Standalone Functions</a>
+<ul class="sectlevel2">
+<li><a href="record-path-guide.html#substring">substring</a></li>
+<li><a href="record-path-guide.html#substringafter">substringAfter</a></li>
+<li><a href="record-path-guide.html#substringafterlast">substringAfterLast</a></li>
+<li><a href="record-path-guide.html#substringbefore">substringBefore</a></li>
+<li><a href="record-path-guide.html#substringbeforelast">substringBeforeLast</a></li>
+<li><a href="record-path-guide.html#replace">replace</a></li>
+<li><a href="record-path-guide.html#replaceregex">replaceRegex</a></li>
+<li><a href="record-path-guide.html#concat">concat</a></li>
+<li><a href="record-path-guide.html#fieldname">fieldName</a></li>
+</ul>
+</li>
+<li><a href="record-path-guide.html#filter_functions">Filter Functions</a>
+<ul class="sectlevel2">
+<li><a href="record-path-guide.html#contains">contains</a></li>
+<li><a href="record-path-guide.html#matchesregex">matchesRegex</a></li>
+<li><a href="record-path-guide.html#startswith">startsWith</a></li>
+<li><a href="record-path-guide.html#endswith">endsWith</a></li>
+<li><a href="record-path-guide.html#not">not</a></li>
+<li><a href="record-path-guide.html#isempty">isEmpty</a></li>
+<li><a href="record-path-guide.html#isblank">isBlank</a></li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<div id="content">
+<div class="sect1">
+<h2 id="overview"><a class="anchor" href="record-path-guide.html#overview"></a>Overview</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Apache NiFi offers a very robust set of Processors that are capable of ingesting, processing,
+routing, transforming, and delivering data of any format. This is possible because the NiFi
+framework itself is data-agnostic. It doesn&#8217;t care whether your data is a 100-byte JSON message
+or a 100-gigabyte video. This is an incredibly powerful feature. However, there are many patterns
+that have quickly developed to handle data of differing types.</p>
+</div>
+<div class="paragraph">
+<p>One class of data that is often processed by NiFi is record-oriented data. When we say record-oriented
+data, we are often (but not always) talking about structured data such as JSON, CSV, and Avro. There
+are many other types of data that can also be represented as "records" or "messages," though. As a result,
+a set of Controller Services have been developed for parsing these different data formats and representing
+the data in a consistent way by using the RecordReader API. This allows data that has been written in any
+data format to be treated the same, so long as there is a RecordReader that is capable of producing a Record
+object that represents the data.</p>
+</div>
+<div class="paragraph">
+<p>When we talk about a Record, this is an abstraction that allows us to treat data in the same
+way, regardless of the format that it is in. A Record is made up of one or more Fields. Each Field has a name
+and a Type associated with it. The Fields of a Record are described using a Record Schema. The Schema indicates
+which fields make up a specific type of Record. The Type of a Field will be one of the following:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>String</p>
+</li>
+<li>
+<p>Boolean</p>
+</li>
+<li>
+<p>Byte</p>
+</li>
+<li>
+<p>Character</p>
+</li>
+<li>
+<p>Short</p>
+</li>
+<li>
+<p>Integer</p>
+</li>
+<li>
+<p>Long</p>
+</li>
+<li>
+<p>BigInt</p>
+</li>
+<li>
+<p>Float</p>
+</li>
+<li>
+<p>Double</p>
+</li>
+<li>
+<p>Date - Represents a Date without a Time component</p>
+</li>
+<li>
+<p>Time - Represents a Time of Day without a Date component</p>
+</li>
+<li>
+<p>Timestamp - Represents a Date and Time</p>
+</li>
+<li>
+<p>Embedded Record - Hierarchical data, such as JSON, can be represented by allowing a field to be of Type Record itself.</p>
+</li>
+<li>
+<p>Choice - A field may be any one of several types.</p>
+</li>
+<li>
+<p>Array - All elements of an array have the same type.</p>
+</li>
+<li>
+<p>Map - All Map Keys are of type String. The Values are of the same type.</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>Once a stream of data has been converted into Records, the RecordWriter API
+allows us to then serialize those Records back into streams of bytes so that they can be passed onto other
+systems.</p>
+</div>
+<div class="paragraph">
+<p>Of course, there&#8217;s not much point in reading and writing this data if we aren&#8217;t going to do something with
+the data in between. There are several processors that have already been developed for NiFi that provide some
+very powerful capabilities for routing, querying, and transforming Record-oriented data. Often times, in order
+to perform the desired function, a processor will need input from the user in order to determine which fields
+in a Record or which values in a Record should be operated on.</p>
+</div>
+<div class="paragraph">
+<p>Enter the NiFi RecordPath language. RecordPath is intended to be a simple, easy-to-use Domain-Specific Language
+(DSL) to specify which fields in a Record we care about or want to access when configuring a processor.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="structure"><a class="anchor" href="record-path-guide.html#structure"></a>Structure of a RecordPath</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>A Record in NiFi is made up of (potentially) many fields, and each of these fields could actually be itself a Record. This means that
+a Record can be thought of as having a hierarchical, or nested, structure. We talk about an "inner Record" as being the child of the
+"outer Record." The child of an inner Record, then, is a descendant of the outer-most Record. Similarly, we can refer to an outer Record
+as being an ancestor of an inner Record.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="child"><a class="anchor" href="record-path-guide.html#child"></a>Child Operator</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>The RecordPath language is structured in such a way that we are able to easily reference fields of the outer-most Record, or fields of a
+child Record, or descendant Record. To accomplish this, we separate the names of the children with a slash character (<code>/</code>), which we
+refer to as the <code>child</code> operator. For example,
+let&#8217;s assume that we have a Record that is made up of two fields: <code>name</code> and <code>details</code>. Also, assume that <code>details</code> is a field that is
+itself a Record and has two Fields: <code>identifier</code> and <code>address</code>. Further, let&#8217;s consider that <code>address</code> is itself a Record that contains
+5 fields: <code>number</code>, <code>street</code>, <code>city</code>, <code>state</code>, and <code>zip</code>. An example, written here in JSON for illustrative purposes may look like this:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>{
+	"name": "John Doe",
+	"details": {
+		"identifier": 100,
+		"address": {
+			"number": "123",
+			"street": "5th Avenue",
+			"city": "New York",
+			"state": "NY",
+			"zip": "10020"
+		}
+	}
+}</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>We can reference the <code>zip</code> field by using the RecordPath: <code>/details/address/zip</code>. This tells us that we want to use the <code>details</code> field of
+the "root" Record. We then want to reference the <code>address</code> field of the child Record and the <code>zip</code> field of that Record.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="descendant"><a class="anchor" href="record-path-guide.html#descendant"></a>Descendant Operator</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>In addition to providing an explicit path to reach the <code>zip</code> field, it may sometimes be useful to reference the <code>zip</code> field without knowing
+the full path. In such a case, we can use the <code>descendant</code> operator (<code>//</code>) instead of the <code>child</code> operator (<code>/</code>). To reach the same <code>zip</code>
+field as above, we can accomplish this by simply using the path <code>//zip</code>.</p>
+</div>
+<div class="paragraph">
+<p>There is a very important distinction, though, between the <code>child</code> operator and the <code>descendant</code> operator: the <code>descendant</code> operator may match
+many fields, whereas the <code>child</code> operator will match at most one field. To help understand this, consider the following Record:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>{
+	"name": "John Doe",
+	"workAddress": {
+		"number": "123",
+		"street": "5th Avenue",
+		"city": "New York",
+		"state": "NY",
+		"zip": "10020"
+	},
+	"homeAddress": {
+		"number": "456",
+		"street": "116th Avenue",
+		"city": "New York",
+		"state": "NY",
+		"zip": "11697"
+	}
+}</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Now, if we use the RecordPath <code>/workAddress/zip</code>, we will be referencing the <code>zip</code> field that has a value of "10020." The RecordPath <code>/homeAddress/zip</code> will
+reference the <code>zip</code> field that has a value of "11697." However, the RecordPath <code>//zip</code> will reference both of these fields.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="filters"><a class="anchor" href="record-path-guide.html#filters"></a>Filters</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>With the above examples and explanation, we are able to easily reference a specific field within a Record. However, in real scenarios, the data is rarely as
+simple as in the examples above. Often times, we need to filter out or refine which fields we are referencing. Examples of when we might want to do this are
+when we reference an Array field and want to only reference some of the elements in the array; when we reference a Map field and want to reference one or a few
+specific entries in the Map; or when we want to reference a Record only if it adheres to some criteria. We can accomplish this by providing our criteria to the
+RecordPath within square brackets (using the <code>[</code> and <code>]</code> characters). We will go over each of these cases below.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="function_usage"><a class="anchor" href="record-path-guide.html#function_usage"></a>Function Usage</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>In addition to retrieving a field from a Record, as outlined above in the <a href="record-path-guide.html#filters">Filters</a> section, we sometimes need to refine which fields we want to select. Or we
+may want to return a modified version of a field. To do this, we rely on functions. The syntax for a function is &lt;function name&gt; &lt;open parenthesis&gt; &lt;args&gt; &lt;close parenthesis&gt;,
+where &lt;args&gt; represents one or more arguments separated by commas. An argument may be a string literal (such as <code>'hello'</code>) or a number literal (such as <code>48</code>), or could be
+a relative or absolute RecordPath (such as <code>./name</code> or <code>/id</code>). Additionally, we can use functions within a filter. For example, we could use a RecordPath such as
+<code>/person[ isEmpty('name') ]/id</code> to retrieve the <code>id</code> field of any person whose name is empty. A listing of functions that are available and their corresponding documentation
+can be found below in the <a href="record-path-guide.html#functions">Functions</a> section.</p>
+</div>
+<div class="sect2">
+<h3 id="arrays"><a class="anchor" href="record-path-guide.html#arrays"></a>Arrays</h3>
+<div class="paragraph">
+<p>When we reference an Array field, the value of the field may be an array that contains several elements, but we may want only a few of those elements. For example,
+we may want to reference only the first element; only the last element; or perhaps the first, second, third, and last elements. We can reference a specific element simply by
+using the index of the element within square brackets (the index is 0-based). So let us consider a modified version of the Record above:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>{
+	"name": "John Doe",
+	"addresses": [
+		"work": {
+			"number": "123",
+			"street": "5th Avenue",
+			"city": "New York",
+			"state": "NY",
+			"zip": "10020"
+		},
+		"home": {
+			"number": "456",
+			"street": "116th Avenue",
+			"city": "New York",
+			"state": "NY",
+			"zip": "11697"
+		}
+	]
+}</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>We can now reference the first element in the <code>addresses</code> array by using the RecordPath <code>/addresses[0]</code>. We can access the second element using the RecordPath <code>/addresses[1]</code>.
+There may be times, though, that we don&#8217;t know how many elements will exist in the array. So we can use negative indices to count backward from the end of the array. For example,
+we can access the last element as <code>/addresses[-1]</code> or the next-to-last element as <code>/addresses[-2]</code>. If we want to reference several elements, we can use a comma-separated list of
+elements, such as <code>/addresses[0, 1, 2, 3]</code>. Or, to access elements 0 through 8, we can use the <code>range</code> operator (<code>..</code>), as in <code>/addresses[0..8]</code>. We can also mix these, and reference
+all elements by using the syntax <code>/addresses[0..-1]</code> or even <code>/addresses[0, 1, 4, 6..-1]</code>. Of course, not all of the indices referenced here will match on the Record above, because
+the <code>addresses</code> array has only 2 elements. The indices that do not match will simply be skipped.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="maps"><a class="anchor" href="record-path-guide.html#maps"></a>Maps</h3>
+<div class="paragraph">
+<p>Similar to an Array field, a Map field may actually consist of several different values. RecordPath gives us the ability to select a set of values based on their keys.
+We do this by using a quoted String within square brackets. As an example, let&#8217;s re-visit our original Record from above:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>{
+	"name": "John Doe",
+	"details": {
+		"identifier": 100,
+		"address": {
+			"number": "123",
+			"street": "5th Avenue",
+			"city": "New York",
+			"state": "NY",
+			"zip": "10020"
+		}
+	}
+}</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Now, though, let&#8217;s consider that the Schema that is associated with the Record indicates that the <code>address</code> field is not a Record but rather a <code>Map</code> field.
+In this case, if we attempt to reference the <code>zip</code> using the RecordPath <code>/details/address/zip</code> the RecordPath will not match because the <code>address</code> field is not a Record
+and therefore does not have any Child Record named <code>zip</code>. Instead, it is a Map field with keys and values of type String.
+Unfortunately, when looking at JSON this may seem a bit confusing because JSON does not truly have a Type system. When we convert the JSON into a Record object in order
+to operate on the data, though, this distinction can be important.</p>
+</div>
+<div class="paragraph">
+<p>In the case laid out above, we can still access the <code>zip</code> field using RecordPath. We must now use the a slightly different syntax, though: <code>/details/address['zip']</code>. This
+is telling the RecordPath that we want to access the <code>details</code> field at the highest level. We then want to access its <code>address</code> field. Since the <code>address</code> field is a <code>Map</code>
+field we can use square brackets to indicate that we want to specify a Map Key, and we can then specify the key in quotes.</p>
+</div>
+<div class="paragraph">
+<p>Further, we can select more than one Map Key, using a comma-separated list: <code>/details/address['city', 'state', 'zip']</code>. We can also select all of the fields, if we want,
+using the Wildcard operator (<code>*</code>): <code>/details/address[*]</code>. Map fields do not contain any sort of ordering, so it is not possible to reference the keys by numeric indices.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="predicates"><a class="anchor" href="record-path-guide.html#predicates"></a>Predicates</h3>
+<div class="paragraph">
+<p>Thus far, we have discussed two different types of filters. Each of them allows us to select one or more elements out from a field that allows for many values.
+Often times, though, we need to apply a filter that allows us to restrict which Record fields are selected. For example, what if we want to select the <code>zip</code> field but
+only for an <code>address</code> field where the state is not New York? The above examples do not give us any way to do this.</p>
+</div>
+<div class="paragraph">
+<p>RecordPath provides the user the ability to specify a Predicate. A Predicate is simply a filter that can be applied to a field in order to determine whether or not the
+field should be included in the results. Like other filters, a Predicate is specified within square brackets. The syntax of the Predicate is
+<code>&lt;Relative RecordPath&gt; &lt;Operator&gt; &lt;Expression&gt;</code>. The <code>Relative RecordPath</code> works just like any other RecordPath but must start with a <code>.</code> (to reference the current field)
+or a <code>..</code> (to reference the current field&#8217;s parent) instead of a slash and references
+fields relative to the field that the Predicate applies to. The <code>Operator</code> must be one of:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Equals (<code>=</code>)</p>
+</li>
+<li>
+<p>Not Equal (<code>!=</code>)</p>
+</li>
+<li>
+<p>Greater Than (<code>&gt;</code>)</p>
+</li>
+<li>
+<p>Greater Than or Equal To (<code>&gt;=</code>)</p>
+</li>
+<li>
+<p>Less Than (<code>&lt;</code>)</p>
+</li>
+<li>
+<p>Less Than or Equal To (<code>&lt;=</code>)</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>The <code>Expression</code> can be a literal value such as <code>50</code> or <code>Hello</code> or can be another RecordPath.</p>
+</div>
+<div class="paragraph">
+<p>To illustrate this, let&#8217;s take the following Record as an example:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>{
+	"name": "John Doe",
+	"workAddress": {
+		"number": "123",
+		"street": "5th Avenue",
+		"city": "New York",
+		"state": "NY",
+		"zip": "10020"
+	},
+	"homeAddress": {
+		"number": "456",
+		"street": "Grand St",
+		"city": "Jersey City",
+		"state": "NJ",
+		"zip": "07304"
+	},
+	"details": {
+		"position": "Dataflow Engineer",
+		"preferredState": "NY"
+	}
+}</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Now we can use a Predicate to choose only the fields where the state is not New York. For example, we can use <code>/*[./state != 'NY']</code>. This will select any Record field
+that has a <code>state</code> field if the state does not have a value of "NY". Note that the <code>details</code> Record will not be returned because it does not have a field named <code>state</code>.
+So in this example, the RecordPath will select only the <code>homeAddress</code> field. Once we have selected that field, we can continue on with our RecordPath. As we stated
+above, we can select the <code>zip</code> field: <code>/*[./state != 'NY']/zip</code>. This RecordPath will result in selecting the <code>zip</code> field only from the <code>homeAddress</code> field.</p>
+</div>
+<div class="paragraph">
+<p>We can also compare the value in one field with the value in another field. For example, we can select the address that is in the person&#8217;s preferred state by using
+the RecordPath <code>/*[./state = /details/preferredState]</code>. In this example, this RecordPath will retrieve the <code>workAddress</code> field because its <code>state</code> field matches the
+value of the <code>preferredState</code> field.</p>
+</div>
+<div class="paragraph">
+<p>Additionally, we can write a RecordPath that references the "city" field of any record whose state is "NJ" by using the parent operator (<code>..</code>): <code>/*/city[../state = 'NJ']</code>.</p>
+</div>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="functions"><a class="anchor" href="record-path-guide.html#functions"></a>Functions</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>In the <a href="record-path-guide.html#function_usage">Function Usage</a> section above, we describe how and why to use a function in RecordPath. Here, we will describe the different functions that are available,
+what they do, and how they work. Functions can be divided into two groups: <a href="record-path-guide.html#standalone_functions">Standalone Functions</a>, which can be the <em>root</em> of a RecordPath, such as <code>substringAfter( /name, ' ' )</code>
+and <a href="record-path-guide.html#filter_functions">Filter Functions</a>, which are to be used as a filter, such as <code>/name[ contains('John') ]</code>. A Standalone Function can also be used within a filter but does not return a <code>boolean</code>
+(<code>true</code> or <code>false</code> value) and therefore cannot itself be an entire filter. For example, we can use a path such as <code>/name[ substringAfter(., ' ') = 'Doe']</code> but we cannot simply use
+<code>/name[ substringAfter(., ' ') ]</code> because doing so doesn&#8217;t really make sense, as filters must be boolean values.</p>
+</div>
+<div class="paragraph">
+<p>Unless otherwise noted, all of the examples below are written to operate on the following Record:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>{
+	"name": "John Doe",
+	"workAddress": {
+		"number": "123",
+		"street": "5th Avenue",
+		"city": "New York",
+		"state": "NY",
+		"zip": "10020"
+	},
+	"homeAddress": {
+		"number": "456",
+		"street": "Grand St",
+		"city": "Jersey City",
+		"state": "NJ",
+		"zip": "07304"
+	},
+	"details": {
+		"position": "Dataflow Engineer",
+		"preferredState": "NY",
+		"employer": "",
+		"vehicle": null,
+		"phrase": "   "
+	}
+}</pre>
+</div>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="standalone_functions"><a class="anchor" href="record-path-guide.html#standalone_functions"></a>Standalone Functions</h2>
+<div class="sectionbody">
+<div class="sect2">
+<h3 id="substring"><a class="anchor" href="record-path-guide.html#substring"></a>substring</h3>
+<div class="paragraph">
+<p>The substring function returns a portion of a String value. The function requires 3 arguments: The value to take a portion of, the 0-based start index (inclusive),
+and the 0-based end index (exclusive). The start index and end index can be <code>0</code> to indicate the first character of a String, a positive integer to indicate the nth index
+into the string, or a negative integer. If the value is a negative integer, say <code>-n</code>, then this represents the <code>n`th character for the end. A value of `-1</code> indicates the last
+character in the String. So, for example, <code>substring( 'hello world', 0, -1 )</code> means to take the string <code>hello</code>, and return characters 0 through the last character, so the return
+value will be <code>hello world</code>.</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substring( /name, 0, -1 )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substring( /name, 0, -5 )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substring( /name, 1000, 1005 )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">&lt;empty string&gt;</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substring( /name, 0, 1005)</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substring( /name, -50, -1)</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">&lt;empty string&gt;</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2">
+<h3 id="substringafter"><a class="anchor" href="record-path-guide.html#substringafter"></a>substringAfter</h3>
+<div class="paragraph">
+<p>Returns the portion of a String value that occurs after the first occurrence of some other value.</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringAfter( /name, ' ' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringAfter( /name, 'o' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">hn Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringAfter( /name, '' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringAfter( /name, 'xyz' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2">
+<h3 id="substringafterlast"><a class="anchor" href="record-path-guide.html#substringafterlast"></a>substringAfterLast</h3>
+<div class="paragraph">
+<p>Returns the portion of a String value that occurs after the last occurrence of some other value.</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringAfterLast( /name, ' ' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringAfterLast( /name, 'o' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">e</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringAfterLast( /name, '' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringAfterLast( /name, 'xyz' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2">
+<h3 id="substringbefore"><a class="anchor" href="record-path-guide.html#substringbefore"></a>substringBefore</h3>
+<div class="paragraph">
+<p>Returns the portion of a String value that occurs before the first occurrence of some other value.</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringBefore( /name, ' ' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringBefore( /name, 'o' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">J</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringBefore( /name, '' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringBefore( /name, 'xyz' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2">
+<h3 id="substringbeforelast"><a class="anchor" href="record-path-guide.html#substringbeforelast"></a>substringBeforeLast</h3>
+<div class="paragraph">
+<p>Returns the portion of a String value that occurs before the last occurrence of some other value.</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringBeforeLast( /name, ' ' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringBeforeLast( /name, 'o' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John D</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringBeforeLast( /name, '' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>substringBeforeLast( /name, 'xyz' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2">
+<h3 id="replace"><a class="anchor" href="record-path-guide.html#replace"></a>replace</h3>
+<div class="paragraph">
+<p>Replaces all occurrences of a String with another String.</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>replace( /name, 'o', 'x' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Jxhn Dxe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>replace( /name, 'o', 'xyz' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Jxyzhn Dxyze</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>replace( /name, 'xyz', 'zyx' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>replace( /name, 'Doe', /workAddress/city )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John New York</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2">
+<h3 id="replaceregex"><a class="anchor" href="record-path-guide.html#replaceregex"></a>replaceRegex</h3>
+<div class="paragraph">
+<p>Evaluates a Regular Expression against the contents of a String value and replaces any match with another value.
+This function requires 3 arguments: the String to run the regular expression against, the regular expression to run,
+and the replacement value. The replacement value may optionally use back-references, such as <code>$1</code> and <code>${named_group}</code></p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>replaceRegex( /name, 'o', 'x' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Jxhn Dxe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>replaceRegex( /name, 'o', 'xyz' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Jxyzhn Dxyze</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>replaceRegex( /name, 'xyz', 'zyx' )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>replaceRegex( /name, '\s+.*', /workAddress/city )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John New York</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>replaceRegex(/name, '([JD])', '$1x')</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Jxohn Dxoe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>replaceRegex(/name, '(?&lt;hello&gt;[JD])', '${hello}x')</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Jxohn Dxoe</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2">
+<h3 id="concat"><a class="anchor" href="record-path-guide.html#concat"></a>concat</h3>
+<div class="paragraph">
+<p>Concatenates all the arguments together.</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>concat( /name, ' lives in ',  /homeAddress/city )</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe lives in Jersey City</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2">
+<h3 id="fieldname"><a class="anchor" href="record-path-guide.html#fieldname"></a>fieldName</h3>
+<div class="paragraph">
+<p>Normally, when a path is given to a particular field in a Record, what is returned is the value of that field. It
+can sometimes be useful, however, to obtain the name of the field instead of the value. To do this, we can use the
+<code>fieldName</code> function.</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>fieldName(//city/..)</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>workAddress</code> and <code>homeAddress</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>//city[not(startsWith(fieldName(..), 'work'))]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Jersey City</p></td>
+</tr>
+</tbody>
+</table>
+<div class="paragraph">
+<p>In the above example, the first RecordPath returns two separate field names: "workAddress" and "homeAddress". The second
+RecordPath, in contrast, returns the value of a "city" field and uses the <code>fieldName</code> function as a predicate. The second
+RecordPath finds a "city" field whose parent does not have a name that begins with "work". This means that it will return
+the value of the "city" field whose parent is "homeAddress" but not the value of the "city" field whose parent is "workAddress".</p>
+</div>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="filter_functions"><a class="anchor" href="record-path-guide.html#filter_functions"></a>Filter Functions</h2>
+<div class="sectionbody">
+<div class="sect2">
+<h3 id="contains"><a class="anchor" href="record-path-guide.html#contains"></a>contains</h3>
+<div class="paragraph">
+<p>Returns <code>true</code> if a String value contains the provided substring, <code>false</code> otherwise</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[contains(., 'o')]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[contains(., 'x')]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">&lt;returns no results&gt;</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[contains( ../workAddress/state, /details/preferredState )]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2">
+<h3 id="matchesregex"><a class="anchor" href="record-path-guide.html#matchesregex"></a>matchesRegex</h3>
+<div class="paragraph">
+<p>Evaluates a Regular Expression against the contents of a String value and returns <code>true</code> if the Regular Expression
+exactly matches the String value, <code>false</code> otherwise.
+This function requires 2 arguments: the String to run the regular expression against, and the regular expression to run.</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[matchesRegex(., 'John Doe')]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[matchesRegex(., 'John')]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">&lt;returns no results&gt;</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[matchesRegex(., '.* Doe' )]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2">
+<h3 id="startswith"><a class="anchor" href="record-path-guide.html#startswith"></a>startsWith</h3>
+<div class="paragraph">
+<p>Returns <code>true</code> if a String value starts with the provided substring, <code>false</code> otherwise</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[startsWith(., 'J')]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[startsWith(., 'x')]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">&lt;returns no results&gt;</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[startsWith(., 'xyz')]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">&lt;returns no results&gt;</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[startsWith(., '')]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2">
+<h3 id="endswith"><a class="anchor" href="record-path-guide.html#endswith"></a>endsWith</h3>
+<div class="paragraph">
+<p>Returns <code>true</code> if a String value ends with the provided substring, <code>false</code> otherwise</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[endsWith(., 'e')]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[endsWith(., 'x')]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">&lt;returns no results&gt;</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[endsWith(., 'xyz')]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">&lt;returns no results&gt;</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[endsWith(., '')]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2">
+<h3 id="not"><a class="anchor" href="record-path-guide.html#not"></a>not</h3>
+<div class="paragraph">
+<p>Inverts the value of the function or expression that is passed into the <code>not</code> function.</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[not(endsWith(., 'x'))]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[not(contains(., 'x'))]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[not(endsWith(., 'e'))]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">&lt;returns no results&gt;</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2">
+<h3 id="isempty"><a class="anchor" href="record-path-guide.html#isempty"></a>isEmpty</h3>
+<div class="paragraph">
+<p>Returns <code>true</code> if the provided value is either null or is an empty string.</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[isEmpty(/details/employer)]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[isEmpty(/details/vehicle)]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[isEmpty(/details/phase)]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">&lt;returns no results&gt;</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[isEmpty(.)]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">&lt;returns no results&gt;</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2">
+<h3 id="isblank"><a class="anchor" href="record-path-guide.html#isblank"></a>isBlank</h3>
+<div class="paragraph">
+<p>Returns <code>true</code> if the provided value is either null or is an empty string or a string that consists
+only of white space (spaces, tabs, carriage returns, and new-line characters).</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">RecordPath</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Return value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[isBlank(/details/employer)]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[isBlank(/details/vehicle)]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[isBlank(/details/phase)]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">John Doe</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>/name[isBlank(.)]</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">&lt;returns no results&gt;</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+</div>
+</div>
+<div id="footer">
+<div id="footer-text">
+Last updated 2017-09-28 14:54:13 -04:00
+</div>
+</div>
+</body>
+</html>
\ No newline at end of file



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