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From: "Andrew Mould" <andrewm@softsell.com>
To: <xmlbeans-user@xml.apache.org>
Subject: Xpath & Namespaces
Date: Thu, 15 Jul 2004 12:21:48 -0700
Message-ID: 
 <C44E4AEE60A2724F93AB4F1122F87B9C29D3BD@zeus.sausalito.softsell.com>
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Hi there,

I'm evaluating XMLBeans but have run into a problem using simple Xpath
expressions with namespaces.=20

I'm using the attached schema and xml file from the "Getting Started =
with
XMLBeans" section of the Apache site
http://xml.apache.org/xmlbeans/docs/guide/conGettingStartedwithXMLBeans.h=
tml

Using selectPath with the following strings on the original XML file =
(which
contains namespaces on each element) I get the following results:

1a:   "declare namespace po =3D 'http://openuri.org/easypo'"
     +
     "./po:purchase-order/po:line-item"
   -> Returns 2 entries


1b:  "declare namespace po =3D 'http://openuri.org/easypo' "
     +
     " ./po:purchase-order/po:line-item[2]"
   -> Returns 0 entries

Result 1b would seem to be incorrect.

Changing the XML file to just use a default namespace I get the =
following:

2a:  "./purchase-order/line-item"
   -> Returns 2 entries

2b:  "./purchase-order/line-item[2]"
   -> Returns 1 entry

Result 2b is now correct.=20

So it would appear that using the positional predicate only works with
default namespaces. I'm not sure if I'm doing something wrong, or =
whether
this is something fixable or what.

Thanks in advance for any help.

- Andrew

Andrew Mould
   Ascert, LLC  415 339-8500 x108.  www.ascert.com
   (Ascert is the parent company of SoftSell Business Systems)

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	name="POTest.java"
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	filename="POTest.java"

import java.io.File;
import java.io.IOException;
import java.math.BigDecimal;
import org.apache.xmlbeans.*;
import org.openuri.easypo.PurchaseOrderDocument;
import org.openuri.easypo.PurchaseOrderDocument.PurchaseOrder;
import org.openuri.easypo.LineItem;
import org.openuri.easypo.Customer;

public class POTest
{
    public static void main( String[] args ) {

       System.out.println("\n=3D=3D=3D=3D=3D=3D xpath test =
=3D=3D=3D=3D=3D=3D=3D");

       // Using XML with namespaces on all elements
       test_xpath(111, "poWithNS.xml", "declare namespace po =3D =
'http://openuri.org/easypo'"
                                 +
                                 "./po:purchase-order/po:line-item");
       test_xpath(112, "poWithNS.xml", "declare namespace po =3D =
'http://openuri.org/easypo' "
                                 +
                                 " =
./po:purchase-order/po:line-item[2]");

       // Using XML without namespaces on elements - using single =
default namespace
       test_xpath(121, "poNoNS.xml", "./purchase-order/line-item");   =20
       test_xpath(122, "poNoNS.xml", "./purchase-order/line-item[2]");=20

    }

    private static void show_result(Object[] results) throws Throwable {
       System.out.println ("Number of results: " + results.length);
       for (int i =3D 0; i < results.length; i++) {
           Object node =3D results[i];
           System.out.println("=3D> class: "+node.getClass() +", obj: =
"+node);
       }
    }

    public static void test_xpath(int id, String xmlFile, String xpath) =
{
       try {
          =
System.out.println("\n=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =
test"+id+" =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D");
          System.out.println("(File: " + xmlFile + "; Expr: \"" + xpath =
+ "\")");

          XmlObject xmlObj =3D XmlObject.Factory.parse(new =
File(xmlFile));
          XmlObject[] results =3D xmlObj.selectPath(xpath);
          show_result(results);
       } catch (Throwable e) {
       e.printStackTrace();
       }
    }=20
   =20


      =20
}

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	name="poNoNs.xml"
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	filename="poNoNs.xml"

<purchase-order xmlns:po="http://openuri.org/easypo">
    <!-- This is a comment -->
    <customer>
        <name>Gladys Kravitz</name>
        <address>Anytown, PA</address>
    </customer>
    <date>2003-01-07T14:16:00-05:00</date>
    <line-item>
        <description>Burnham's Celestial Handbook, Vol 1</description>
        <per-unit-ounces>5</per-unit-ounces>
        <price>21.79</price>
        <quantity>3</quantity>
    </line-item>
    <line-item>
        <description>Burnham's Celestial Handbook, Vol 2</description>
        <per-unit-ounces>5</per-unit-ounces>
        <price>19.89</price>
        <quantity>4</quantity>
    </line-item>
    <shipper>
        <name>ZipShip</name>
        <per-ounce-rate>0.74</per-ounce-rate>
    </shipper>
</purchase-order>

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Content-Type: text/xml;
	name="po.xsd"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: attachment;
	filename="po.xsd"

<xs:schema targetNamespace=3D"http://openuri.org/easypo"
    xmlns:po=3D"http://openuri.org/easypo"
    xmlns:xs=3D"http://www.w3.org/2001/XMLSchema"
    elementFormDefault=3D"qualified">
=09
    <xs:element name=3D"purchase-order">
        <xs:complexType>
            <xs:sequence>
                <xs:element name=3D"customer" type=3D"po:customer"/>
                <xs:element name=3D"date" type=3D"xs:dateTime"/>
                <xs:element name=3D"line-item" type=3D"po:line-item" =
minOccurs=3D"0" maxOccurs=3D"unbounded"/>
                <xs:element name=3D"shipper" type=3D"po:shipper" =
minOccurs=3D"0"/>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:complexType name=3D"customer">
        <xs:sequence>
            <xs:element name=3D"name" type=3D"xs:string"/>
            <xs:element name=3D"address" type=3D"xs:string"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name=3D"line-item">
        <xs:sequence>
            <xs:element name=3D"description" type=3D"xs:string"/>
            <xs:element name=3D"per-unit-ounces" type=3D"xs:decimal"/>
            <xs:element name=3D"price" type=3D"xs:double"/>
            <xs:element name=3D"quantity" type=3D"xs:int"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name=3D"shipper">
        <xs:sequence>
            <xs:element name=3D"name" type=3D"xs:string"/>
            <xs:element name=3D"per-ounce-rate" type=3D"xs:decimal"/>
        </xs:sequence>
    </xs:complexType>
</xs:schema>
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Content-Type: text/xml;
	name="poWithNS.xml"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: attachment;
	filename="poWithNS.xml"

<po:purchase-order xmlns:po=3D"http://openuri.org/easypo">
    <po:customer>
        <po:name>Gladys Kravitz</po:name>
        <po:address>Anytown, PA</po:address>
    </po:customer>
    <po:date>2003-01-07T14:16:00-05:00</po:date>
    <po:line-item>
        <po:description>Burnham's Celestial Handbook, Vol =
1</po:description>
        <po:per-unit-ounces>5</po:per-unit-ounces>
        <po:price>21.79</po:price>
        <po:quantity>2</po:quantity>
    </po:line-item>
    <po:line-item>
        <po:description>Burnham's Celestial Handbook, Vol =
2</po:description>
        <po:per-unit-ounces>5</po:per-unit-ounces>
        <po:price>19.89</po:price>
        <po:quantity>2</po:quantity>
    </po:line-item>
    <po:shipper>
        <po:name>ZipShip</po:name>
        <po:per-ounce-rate>0.74</po:per-ounce-rate>
    </po:shipper>
</po:purchase-order>


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