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From conflue...@apache.org
Subject [CONF] Apache CXF 2.0 Documentation: How It Works (page edited)
Date Thu, 12 Apr 2007 11:59:00 GMT
<html>
<head>
    <base href="http://cwiki.apache.org/confluence" />
    <style type="text/css">
    <!--
    body, p, td, table, tr, .bodytext, .stepfield {
	font-family: Verdana, arial, sans-serif;
	font-size: 11px;
	line-height: 16px;
	color: #000000;
	font-weight: normal;
}
#PageContent {
	text-align: left;
	background-color: #fff;
	padding: 0px;
	margin: 0px;
    padding-bottom:20px;
}
/*
** when this stylesheet is used for the Tiny MCE Wysiwyg editor's edit area, we can't
** use an id=PageContent or class=wiki-content, so we must
** set the body style to that used for PageContent, and p to that used for wiki-content.
*/

body {
	margin: 0px;
	padding: 0px;
	text-align: center;
    background-color: #f0f0f0;
}

@media print {

body {
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}

}

.monospaceInput {
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}

.wiki-content p, .commentblock p {
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    padding: 0px;
}

.wiki-content-preview {
    padding: 5px;
    border-left: 1px solid #3c78b5;
    border-right: 1px solid #3c78b5;
}

ul, ol {
    margin-top: 2px;
    margin-bottom: 2px;
    padding-top: 0px;
    padding-bottom: 0px;
}

pre {
    padding: 0px;
    margin-top: 5px;
    margin-left: 15px;
    margin-bottom: 5px;
    margin-right: 5px;
    text-align: left;
}

.helpheading {
    font-weight: bold;
    background-color: #D0D9BD;
        border-bottom: 1px solid #3c78b5;
        padding: 4px 4px 4px 4px;
        margin: 0px;
        margin-top: 10px;
}
.helpcontent {
        padding: 4px 4px 20px 4px;
    background-color: #f5f7f1;
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.code {
 	border: 1px dashed #3c78b5;
    font-size: 11px;
	font-family: Courier;
    margin: 10px;
	line-height: 13px;
}

.focusedComment {
    background: #ffffce;
}

.commentBox, .focusedComment {
    padding: 10px;
    margin: 5px 0 5px 0;
    border: 1px #bbb solid;
}

.codeHeader {
    background-color: #f0f0f0;
 	border-bottom: 1px dashed #3c78b5;
    padding: 3px;
	text-align: center;
}

.codeContent {
    text-align: left;
    background-color: #f0f0f0;
    padding: 3px;
}

.preformatted {
 	border: 1px dashed #3c78b5;
    font-size: 11px;
	font-family: Courier;
    margin: 10px;
	line-height: 13px;
}

.preformattedHeader {
    background-color: #f0f0f0;
 	border-bottom: 1px dashed #3c78b5;
    padding: 3px;
	text-align: center;
}

.preformattedContent {
    background-color: #f0f0f0;
    padding: 3px;
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.panel {
 	border: 1px dashed #3c78b5;
    margin: 10px;
    margin-top: 0px;
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.panelHeader {
    background-color: #f0f0f0;
 	border-bottom: 1px dashed #3c78b5;
    padding: 3px;
	text-align: center;
}

.panelContent {
    background-color: #f0f0f0;
    padding: 5px;
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.anonymousAlert {
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 	border: 1px dashed red;
    font-size: 11px;
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    margin: 4px;
	line-height: 13px;
}

.lockAlert {
    background-color: #f0f0f0;
    width: 50%;
 	border: 1px dashed red;
    font-size: 11px;
    padding: 10px 5px 10px 5px;
    margin: 4px;
	line-height: 13px;
}


.code-keyword {
  color: #000091;
  background-color: inherit;
}

.code-object {
  color: #910091;
  background-color: inherit;
}

.code-quote {
  color: #009100;
  background-color: inherit;
}

.code-comment {
  color: #808080;
  background-color: inherit;
}


.code-xml .code-keyword {
  color: inherit;
  font-weight: bold;
}

.code-tag {
  color: #000091;
  background-color: inherit;
}

.breadcrumbs {
    background-color: #f0f0f0;
 	border-color: #3c78b5;
	border-width: 1px 0px 1px 0px;
	border-style: solid;
    font-size: 11px;
    padding: 3px 0px 3px 0px;
}

.navmenu {
    border: 1px solid #ccc;
}

.menuheading {
    font-weight: bold;
    background-color: #f0f0f0;
 	border-bottom: 1px solid #3c78b5;
	padding: 4px 4px 2px 4px;
}

.menuitems {
	padding: 4px 4px 20px 4px;
}

.rightpanel {
    border-left: 1px solid #ccc;
    border-bottom: 1px solid #ccc;
}

#helpheading {
    text-align: left;
    font-weight: bold;
    background-color: #D0D9BD;
 	border-bottom: 1px solid #3c78b5;
	padding: 4px 4px 4px 4px;
	margin: 0px;
}
#helpcontent {
	padding: 4px 4px 4px 4px;
    background-color: #f5f7f1;
}
.helptab-unselected {
    font-weight: bold;
	padding: 5px;
    background-color: #f5f7f1;
}
.helptab-selected {
    font-weight: bold;
    background-color: #D0D9BD;
	padding: 5px;
}
.helptabs {
    margin: 0px;
    background-color: #f5f7f1;
	padding: 5px;
}
.infopanel-heading {
    font-weight: bold;
	padding: 4px 0px 2px 0px;
}

.pagebody {
}

.pageheader {
	padding: 5px 5px 5px 0px;
 	border-bottom: 1px solid #3c78b5;
}

.pagetitle {
	font-size: 22px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: #003366;
}

.newpagetitle {
    color: #ccc !important;
}

.steptitle {
	font-size: 18px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: #003366;
	margin-bottom: 7px;
}

.substeptitle {
    font-size: 12px;
    font-weight: bold;
    font-family: Arial, sans-serif;
    color: #003366;
    margin: 2px 4px 4px 4px;
    padding: 2px 4px 1px 4px;
}

.stepdesc {
    font-family: Verdana, arial, sans-serif;
	font-size: 11px;
	line-height: 16px;
	font-weight: normal;
    color: #666666;
    margin-top: 7px;
    margin-bottom: 7px;
}

.steplabel {
    font-weight: bold;
    margin-right: 4px;
    color: black;
    float: left;
    width: 15%;
    text-align: right;
}

.stepfield {
    background: #f0f0f0;
    padding: 5px;
}

.submitButtons{
    margin-top:5px;
    text-align:right;
}

.formtitle {
	font-size: 12px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: #003366;
}

.sectionbottom {
    border-bottom: 1px solid #3c78b5;
}

.topRow {
    border-top: 2px solid #3c78b5;
}

.tabletitle {
	font-size: 14px;
	font-weight: bold;
	font-family: Arial, sans-serif;
    padding: 3px 0px 2px 0px;
    margin: 8px 4px 2px 0px;
	color: #003366;
	border-bottom: 2px solid #3c78b5;
}
.pagesubheading {
    color: #666666;
    font-size: 10px;
    padding: 0px 0px 5px 0px;
}

HR {
	color: 3c78b5;
	height: 1;
}

A:link, A:visited, A:active, A:hover {
	color: #003366;
}

h1 A:link, h1 A:visited, h1 A:active {
	text-decoration: none;
}

h1 A:hover {
    border-bottom: 1px dotted #003366;
}

.wiki-content > :first-child, .commentblock > :first-child {
    margin-top: 3px;
}

.logocell {
    padding: 10px;
}

input {
	font-family: verdana, geneva, arial, sans-serif;
	font-size: 11px;
	color: #000000;
}

textarea, textarea.editor {
	font-family: verdana, geneva, arial, sans-serif;
	font-size: 11px;
	color: #333333;
}

/* use logoSpaceLink instead.
.spacenametitle {
	font: 21px/31px Impact, Arial, Helvetica;
    font-weight: 100;
    color: #999999;
	margin: 0px;
}
.spacenametitle img {
  margin: 0 0 -4px 0;
}
.spacenametitle a {
    text-decoration: none;
    color: #999999;
}
.spacenametitle a:visited {
    text-decoration: none;
    color: #999999;
}*/

.spacenametitle-printable {
	font: 20px/25px Impact, Arial, Helvetica;
    font-weight: 100;
    color: #999999;
	margin: 0px;
}
.spacenametitle-printable a {
    text-decoration: none;
    color: #999999;
}
.spacenametitle-printable a:visited {
    text-decoration: none;
    color: #999999;
}

.blogDate {
	font-weight: bold;
	text-decoration: none;
	color: black;
}

.blogSurtitle {
    background: #f0f0f0;
 	border: 1px solid #ddd;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.blogHeading {
    font-size: 20px;
    line-height: normal;
    font-weight: bold;
    padding: 0px;
    margin: 0px;
}

.blogHeading a {
   text-decoration: none;
   color: black;
}

.endsection {
	align: right;
	color: #666666;
	margin-top: 10px;
}
.endsectionleftnav {
	align: right;
	color: #666666;
	margin-top: 10px;
}

h1 {
	font-size: 24px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	color: #003366;
 	border-bottom: 1px solid #3c78b5;
	padding: 2px;
	margin: 36px 0px 4px 0px;
}

h2 {
	font-size: 18px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
 	border-bottom: 1px solid #3c78b5;
	padding: 2px;
	margin: 27px 0px 4px 0px;
}

h3 {
	font-size: 14px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 21px 0px 4px 0px;
}

h4 {
	font-size: 12px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 18px 0px 4px 0px;
}

h4.search {
	font-size: 12px;
	line-height: normal;
	font-weight: normal;
	background-color: #f0f0f0;
	padding: 4px;
	margin: 18px 0px 4px 0px;
}

h5 {
	font-size: 10px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 14px 0px 4px 0px;
}

h6 {
	font-size: 8px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 14px 0px 4px 0px;
}

.smallfont {
    font-size: 10px;
}
.descfont {
    font-size: 10px;
    color: #666666;
}
.smallerfont {
    font-size: 9px;
}
.smalltext {
    color: #666666;
    font-size: 10px;
}
.smalltext a {
    color: #666666;
}
.smalltext-blue {
    color: #3c78b5;
    font-size: 10px;
}
.surtitle {
    margin-left: 1px;
    margin-bottom: 5px;
    font-size: 14px;
    color: #666666;
}

/* css hack found here:  http://www.fo3nix.pwp.blueyonder.co.uk/tutorials/css/hacks/ */
.navItemOver { font-size: 10px; font-weight: bold; color: #ffffff; background-color: #003366;
cursor: hand; voice-family: '\'}\''; voice-family:inherit; cursor: pointer;}
.navItemOver a { color: #ffffff; background-color:#003366; text-decoration: none; }
.navItemOver a:visited { color: #ffffff; background-color:#003366; text-decoration: none;
}
.navItemOver a:hover { color: #ffffff; background-color:#003366; text-decoration: none; }
.navItem { font-size: 10px; font-weight: bold; color: #ffffff; background-color: #3c78b5;
}
.navItem a { color: #ffffff; text-decoration: none; }
.navItem a:hover { color: #ffffff; text-decoration: none; }
.navItem a:visited { color: #ffffff; text-decoration: none; }

div.padded { padding: 4px; }
div.thickPadded { padding: 10px; }
h3.macrolibrariestitle {
    margin: 0px 0px 0px 0px;
}

div.centered { text-align: center; margin: 10px; }
div.centered table {margin: 0px auto; text-align: left; }

.tableview table {
    margin: 0;
}

.tableview th {
    text-align: left;
    color: #003366;
    font-size: 12px;
    padding: 5px 0px 0px 5px;
    border-bottom: 2px solid #3c78b5;
}
.tableview td {
    text-align: left;
    border-color: #ccc;
    border-width: 0px 0px 1px 0px;
    border-style: solid;
    margin: 0;
    padding: 4px 10px 4px 5px;
}

.grid {
    margin: 2px 0px 5px 0px;
    border-collapse: collapse;
}
.grid th  {
    border: 1px solid #ccc;
    padding: 2px 4px 2px 4px;
    background: #f0f0f0;
    text-align: center;
}
.grid td  {
    border: 1px solid #ccc;
    padding: 3px 4px 3px 4px;
}
.gridHover {
	background-color: #f9f9f9;
}

td.infocell {
    background-color: #f0f0f0;
}
.label {
	font-weight: bold;
	color: #003366;
}

label {
	font-weight: bold;
	color: #003366;
}

.error {
	background-color: #fcc;
}

.errorBox {
	background-color: #fcc;
    border: 1px solid #c00;
    padding: 5px;
    margin: 5px;
}

.errorMessage {
	color: #c00;
}

.success {
	background-color: #dfd;
}

.successBox {
	background-color: #dfd;
    border: 1px solid #090;
    padding: 5px;
    margin-top:5px;
    margin-bottom:5px;
}

blockquote {
	padding-left: 10px;
	padding-right: 10px;
	margin-left: 5px;
	margin-right: 0px;
	border-left: 1px solid #3c78b5;
}

table.confluenceTable
{
    margin: 5px;
    border-collapse: collapse;
}

/* Added as a temporary fix for CONF-4223. The table elements appear to be inheriting the
border: none attribute from the sectionMacro class */
table.confluenceTable td.confluenceTd
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
}

/* Added as a temporary fix for CONF-4223. The table elements appear to be inheriting the
border: none attribute from the sectionMacro class */
table.confluenceTable th.confluenceTh
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
    background-color: #f0f0f0;
    text-align: center;
}

td.confluenceTd
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
}

th.confluenceTh
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
    background-color: #f0f0f0;
    text-align: center;
}

DIV.small {
	font-size: 9px;
}

H1.pagename {
	margin-top: 0px;
}

IMG.inline  {}

.loginform {
    margin: 5px;
    border: 1px solid #ccc;
}

/* The text how the "This is a preview" comment should be shown. */
.previewnote { text-align: center;
                font-size: 11px;
                    color: red; }

/* How the preview content should be shown */
.previewcontent { background: #E0E0E0; }

/* How the system messages should be shown (DisplayMessage.jsp) */
.messagecontent { background: #E0E0E0; }

/* How the "This page has been modified..." -comment should be shown. */
.conflictnote { }

.createlink {
    color: maroon;
}
a.createlink {
    color: maroon;
}
.templateparameter {
    font-size: 9px;
    color: darkblue;
}

.diffadded {
    background: #ddffdd;
    padding: 1px 1px 1px 4px;
	border-left: 4px solid darkgreen;
}
.diffdeleted {
    color: #999;
    background: #ffdddd;
    padding: 1px 1px 1px 4px;
	border-left: 4px solid darkred;
}
.diffnochange {
    padding: 1px 1px 1px 4px;
	border-left: 4px solid lightgrey;
}
.differror {
    background: brown;
}
.diff {
    font-family: lucida console, courier new, fixed-width;
	font-size: 12px;
	line-height: 14px;
}
.diffaddedchars {
    background-color:#99ff99;
    font-weight:bolder;
}
.diffremovedchars {
    background-color:#ff9999;
    text-decoration: line-through;
    font-weight:bolder;
}

.greybackground {
    background: #f0f0f0
}

.greybox {
 	border: 1px solid #ddd;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.borderedGreyBox {
    border: 1px solid #cccccc;
    background-color: #f0f0f0;
    padding: 10px;
}

.greyboxfilled {
 	border: 1px solid #ddd;
    background: #f0f0f0;
    padding: 3px;
	margin: 1px 1px 10px 1px;
}

.navBackgroundBox {
    padding: 5px 5px 5px 5px;
    font-size: 22px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: white;
    background: #3c78b5;
    text-decoration: none;
}

.previewBoxTop {
	background-color: #f0f0f0;
    border-width: 1px 1px 0px 1px;
    border-style: solid;
    border-color: #3c78b5;
    padding: 5px;
    margin: 5px 0px 0px 0px;
    text-align: center;
}
.previewContent {
    background-color: #fff;
 	border-color: #3c78b5;
	border-width: 0px 1px 0px 1px;
	border-style: solid;
	padding: 10px;
	margin: 0px;
}
.previewBoxBottom {
	background-color: #f0f0f0;
    border-width: 0px 1px 1px 1px;
    border-style: solid;
    border-color: #3c78b5;
    padding: 5px;
    margin: 0px 0px 5px 0px;
    text-align: center;
}

.functionbox {
    background-color: #f0f0f0;
 	border: 1px solid #3c78b5;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.functionbox-greyborder {
    background-color: #f0f0f0;
 	border: 1px solid #ddd;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.search-highlight {
    background-color: #ffffcc;
}

/* normal (white) background */
.rowNormal {
    background-color: #ffffff;
 }

/* alternate (pale yellow) background */
.rowAlternate {
    background-color: #f7f7f7;
}

/* used in the list attachments table */
.rowAlternateNoBottomColor {
    background-color: #f7f7f7;
}

.rowAlternateNoBottomNoColor {
}

.rowAlternateNoBottomColor td {
    border-bottom: 0px;
}

.rowAlternateNoBottomNoColor td {
    border-bottom: 0px;
}

/* row highlight (grey) background */
.rowHighlight {
    background-color: #f0f0f0;

}

TD.greenbar {FONT-SIZE: 2px; BACKGROUND: #00df00; BORDER: 1px solid #9c9c9c; PADDING: 0px;
}
TD.redbar {FONT-SIZE: 2px; BACKGROUND: #df0000; BORDER: 1px solid #9c9c9c; PADDING: 0px; }
TD.darkredbar {FONT-SIZE: 2px; BACKGROUND: #af0000; BORDER: 1px solid #9c9c9c; PADDING: 0px;
}

TR.testpassed {FONT-SIZE: 2px; BACKGROUND: #ddffdd; PADDING: 0px; }
TR.testfailed {FONT-SIZE: 2px; BACKGROUND: #ffdddd; PADDING: 0px; }

.toolbar  {
    margin: 0px;
    border-collapse: collapse;
}

.toolbar td  {
    border: 1px solid #ccc;
    padding: 2px 2px 2px 2px;
    color: #ccc;
}

td.noformatting {
    border-width: 0px;
    border-style: none;
    text-align: center;
	padding: 0px;
}

.commentblock {
    margin: 12px 0 12px 0;
}

/*
 * Divs displaying the license information, if necessary.
 */
.license-eval, .license-none, .license-nonprofit {
    border-top: 1px solid #bbbbbb;
    text-align: center;
    font-size: 10px;
    font-family: Verdana, Arial, Helvetica, sans-serif;
}

.license-eval, .license-none {
    background-color: #ffcccc;
}

.license-eval b, .license-none b {
    color: #990000
}

.license-nonprofit {
    background-color: #ffffff;
}

/*
 * The shadow at the bottom of the page between the main content and the
 * "powered by" section.
 */
.bottomshadow {
    height: 12px;
    background-image: url("$req.contextPath/images/border/border_bottom.gif");
    background-repeat: repeat-x;
}

/*
 * Styling of the operations box
 */
.navmenu .operations li, .navmenu .operations ul {
    list-style: none;
    margin-left: 0;
    padding-left: 0;
}

.navmenu .operations ul {
    margin-bottom: 9px;
}

.navmenu .label {
    font-weight: inherit;
}

/*
 * Styling of ops as a toolbar
 */
.toolbar div {
    display: none;
}

.toolbar .label {
    display: none;
}

.toolbar .operations {
    display: block;
}

.toolbar .operations ul {
    display: inline;
    list-style: none;
    margin-left: 10px;
    padding-left: 0;
}

.toolbar .operations li {
    list-style: none;
    display: inline;
}

/* list page navigational tabs */
#foldertab {
padding: 3px 0px 3px 8px;
margin-left: 0;
border-bottom: 1px solid #3c78b5;
font: bold 11px Verdana, sans-serif;
}

#foldertab li {
list-style: none;
margin: 0;
display: inline;
}

#foldertab li a {
padding: 3px 0.5em;
margin-left: 3px;
border: 1px solid #3c78b5;
border-bottom: none;
background: #3c78b5;
text-decoration: none;
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</head>
<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/CXF20DOC">CXF20DOC</a>
:
            <a href="http://cwiki.apache.org/confluence/display/CXF20DOC/How+It+Works">How
It Works</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/CXF20DOC/How+It+Works">How
It Works</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~andreasmyth">Andrea
Smyth</a>
            <span class="smallfont">(Apr 12, 2007)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=51375&originalVersion=1&revisedVersion=2">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><h2><a name="HowItWorks-RetrievalofPolicies"></a>Retrieval
of Policies</h2>

<p>Policies are associated with policy subjects. In the web services context, there
are four different subjects:</p>
<ul>
	<li>Service</li>
	<li>Endpoint</li>
	<li>Operation</li>
	<li>Message</li>
</ul>


<p>Using WSDL 1.1, the policy-subject association usually takes the form of <b>xml
element attachment</b>: a wsp:Policy element is attached to a WSDL element such as wsdl:port
Ythe wsp prefix denotes the <span class="nobr"><a href="http://www.w3.org/2006/07/ws-policy"
title="Visit page outside Confluence" rel="nofollow">http://www.w3.org/2006/07/ws-policy<sup><img
class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span> namespace). Similary, wsp:PolicyReference
elements can be attached to a wsdl element. In that case, the actual wsp:policy element may
reside outside of the wsdl). Note that subjects do not correspond to wsdl elements directly.
Rather, they map to a set of wsdl elements (see below). For example wsdl:port, wsdl:portType
and wsdl:binding elements together describe the endpoint as a subject.</p>

<p>Another form of associating policies with policy subjects is <b>external attachment</b>:
wsp:PolicyAttachment elements, which can reside in arbitrary locations, explicitly specify
the subject(s) they apply to in their AppliesTo child element.</p>

<p>In CXF, elements attached to a wsdl element are available as extensors in the service
model representation of that wsdl element: wsp:Policy and wsdp:PolicyReference elements can
be obtained through the service model as extensors of type UnknownExtensibilityElement with
matching element names (note that these attached elements are not parsed when the service
model is built).<br/>
Policies attached to their subject through xml element attachment in WSDL 1.1 can therefore
be obtained through the service model associated with an endpoint/an operation.</p>

<p>The location of documents containing PolicyAttachment documents on the other hand
needs to be made known to the framework. This can easily be done through configuration:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">&lt;bean class=<span class="code-quote">"org.apache.cxf.ws.policy.attachment.external.ExternalAttachmentProvider"</span>&gt;
    &lt;constructor-arg ref=<span class="code-quote">"cxf"</span>/&gt;
    &lt;property name=<span class="code-quote">"location"</span> value=<span
class="code-quote">"org/apache/cxf/systest/ws/policy/addr-external.xml"</span>/&gt;
&lt;/bean&gt;</pre>
</div></div>
<p>The location of the document containing PolicyAttachments is specified in the form
of a classpath resource or URL. Any number of external attachment providers can be specified.
</p>

<p>Note that PolicyAttachments are extensible w.r.t. the type of domain expressions.
Domain expressions are used to identify entities such as endpoints, operations or messages
with which a policy can be associated:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">&lt;wsp:PolicyAttachment&gt;
    &lt;wsp:AppliesTo&gt; 
        &lt;x:DomainExpression/&gt; +
    &lt;/wsp:AppliesTo&gt;
    (&lt;wsp:Policy&gt;...&lt;/wsp:Policy&gt; | &lt;wsp:PolicyReference&gt;...&lt;/wsp:PolicyReference&gt;)
&lt;/wsp:PolicyAttachment&gt;</pre>
</div></div>
<p>Currently, CXF supports domain only domain expressions of type wsa:EndpointReferenceType:
This allows to associate the policies or policy references in an attachment with an endpoint
(by means of matching the endpoint's address with that in the EndpointReferenceType element).<br/>
Support for other types of domain expressions can be plugged in by implementing the DomainExpressionBuilder
interface and adding a corresponding bean to your configuration file (all DomainExpressionBuilder
instances loaded that way will automatically register with the DomainExpressionBuilder and
thus be considered in the process of parsing PolicyAttachment elements).</p>

<p>Now that the framework knows where to look for wsp:Policy, it parses the elements
and creates runtime presentations for them. This is where AssertionBuilders come into play:
Child elements of a wsp:Policy element that are not in the wsp namespace are considered to
be assertions. The framework will use its AssertionBuilderRegistry to find an AssertionBuilder
registered for the element type in question and in that case proceed to build an Assertion
object (or else throw a PolicyException).</p>

<h2><a name="HowItWorks-ComputationofEffectivePolicies"></a>Computation
of Effective Policies</h2>

<p>As mentioned above, policies are associated with policy subjects. With WSDL 1.1,
the effective policy for a subject is the aggregation, or the merge, of the policies attached
to the wsdl elments representing that subject: <br/>
The effective policy for a <em>service subject</em> is the merge of all policies
applying to the wsdl:service element.<br/>
The effective policy for an <em>endpoint subject</em> is the merge of all policies
applying to the wsdl:port, wsdl:portType and wsdl:binding elements.<br/>
The effective policy for an <em>operation subject</em> is the merge of all policies
applying to the wsdl:portType/wsdl:operation and wsdl:binding/wsdl:operation elements.<br/>
The effective policy for a <em>(input | output | fault) message subject</em> is
the merge of all policies applying to the wsdl:message, (wsdl:portType/wsdl:operation/wsdl:input
| wsdl:portType/wsdl:operation/wsdl:output | wsdl:portType/wsdl:operation/wsdl:fault) and
(wsdl:binding/wsdl:operation/wsdl:input | wsdl:binding/wsdl:operation/wsdl:output | wsdl:binding/wsdl:operation/wsdl:fault).</p>

<p>Additional aggregation takes place to determine the effective policy of an endpoint:
<br/>
The effective policy for a service is the effective policy for the service subject.<br/>
The effective policy for an endpoint is the merge of the effective policies for the service
subject and the endpoint subject.<br/>
The effective policy for an operation is the merge of the effective policies for the service
subject, the endpoint subject and the operation subject.<br/>
The effective policy for a (input | output | fault) message is the merge of the effective
policies for the service subject, the endpoint subject, the operation subject and the message
subject.</p>


<p>Note that multiple sources can be used to supply policies applying to the same subject.
In the case of the endpoint subject for example, the wsdl:port element may have multiple wsp:Policy
child elements. An additional external provider may contain multiple wsp:PolicyAttachment
elements in which the AppliesTo children identify the underlying endpoint as the target subject.
Both the Policies attached to the port element as well as that appear in the matching PolicyAttachment
elements will contribute to the effective policy of the endpoint subject.</p>

<p>Althoguh it would not be the normal use case, it is important to keep in mind that
this complex aggregation process makes it possible for an effective policy to have multiple
assertion elements of the same type in the same alternative. It is NOT the case that these
different assertions overwrite each other. These may or may not be compatible with each other
- a decision that cannot be made by the framework alone but which needs the involvement of
the assertion builder.</p>

<p>It is also obvious that the above aggregation process can be quite resource intense.
Effective policies for messages and endpoints are therefore cached by the framework for future
reference. The entity that manages the cache of effective policies is the PolicyEngine. </p>

<p>At the same time of computing the effective policy for an endpoint or a message,
the framework chooses one of the effective policy's alternatives. Currently, the first alternative
that in principle can be supported by interceptors (i.e. for which there is a PolicyInterceptorProvider)
or by the conduit/destination is chosen. This choice, along with the set of interceptors (obtained
from the PolicyInterceptorProviders in the PolicyInterceptorProviderRegistry), is cached along
with the actual effective message or endpoint policy in the form of an EffectivePolicy or
EffectiveEndpointPolicy object. In the case of an effective endpoint policy, interceptors
are chosen in such a way that the assertions in the chosen alternative of the effective endpoint
policy can be supported, but also any assertion in any alternative of any of the operation
and message specific policies. This is necessary in situations where the underlying message
is not yet know, for example on the server onbound path: Once an alternative has been chosen
for the effective policy of the server's endpoint we know which assertions must definitely
be supported, regardless the underlying message/operation. Additional interceptors that are
necessary to support the assertions that only appear in specific operation or input message
policies are added pre-emptively. Note that this relies on interceptors being coded defensively
- good practice anyway but especially so for interceptors returned by PolicyInterceptorProviders!</p>

<h2><a name="HowItWorks-OntheflyProvisionofInterceptors"></a>On-the-fly
Provision of Interceptors</h2>

<p>The policy framework, when activated (by loading the PolicyEngine and setting its
"enabled" attribute to true), installs a couple of interceptors at bus level which execute
early on in their respective interceptor chains:</p>
<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'> Role </th>
<th class='confluenceTh'> Direction </th>
<th class='confluenceTh'> Phase </th>
<th class='confluenceTh'> Interceptor </th>
<th class='confluenceTh'> Effective Subject Policies Known </th>
</tr>
<tr>
<td class='confluenceTd'> Client </td>
<td class='confluenceTd'> Out </td>
<td class='confluenceTd'> SETUP </td>
<td class='confluenceTd'> Client PolicyOutInterceptor </td>
<td class='confluenceTd'> Service, Endpoint, Operation, (Input) Message </td>
</tr>
<tr>
<td class='confluenceTd'> Client </td>
<td class='confluenceTd'> In </td>
<td class='confluenceTd'> RECEIVE </td>
<td class='confluenceTd'> ClientPolicyInInterceptor </td>
<td class='confluenceTd'> Service, Endpoint </td>
</tr>
<tr>
<td class='confluenceTd'> Client </td>
<td class='confluenceTd'> In </td>
<td class='confluenceTd'> RECEIVE </td>
<td class='confluenceTd'> ClientPolicyInFaultInterceptor </td>
<td class='confluenceTd'> Service, Endpoint </td>
</tr>
<tr>
<td class='confluenceTd'> Server</td>
<td class='confluenceTd'> In </td>
<td class='confluenceTd'> RECEIVE </td>
<td class='confluenceTd'> ServerPolicyInInterceptor </td>
<td class='confluenceTd'> Service, Endpoint </td>
</tr>
<tr>
<td class='confluenceTd'> Server</td>
<td class='confluenceTd'> Out </td>
<td class='confluenceTd'> SETUP</td>
<td class='confluenceTd'> ServerPolicyOutFaultInterceptor </td>
<td class='confluenceTd'> Service, Endpoint, Operation, (Fault) Message </td>
</tr>
<tr>
<td class='confluenceTd'> Server</td>
<td class='confluenceTd'> Out </td>
<td class='confluenceTd'> SETUP</td>
<td class='confluenceTd'> ServerPolicyOutInterceptor </td>
<td class='confluenceTd'> Service, Endpoint, Operation, (Out) Message </td>
</tr>
</tbody></table>

<p>Their main function is to add interceptors that are required to support the effective
policy of the underlying message - even if that policy is not yet known at this point (because
the operation is not yet known).  <br/>
In case where the effective message policy is known, the assertions of its selected alternative
are inserted into the message in the form of an AssertionInfoMap. This way subsequent interceptors
need not be concerned about the details of obtaining the effective mssage policy (obtaining
the PolicyEngine, knowing which of its API methods to use and how to obtainaing the corresponding
parameters for the call) but can simply pick up the AssertionInfoMap from the message and
from that obtain a collection of assertions that they can understand.<br/>
Where the effective message policy is not known, not only the assertions for the selected
altervive in the effective endpoint policy are made available to the message, but all assertions
in  assertion in all alternative of all of the operation and message specific policies as
well. Not all of them will be asserted at the end of the chain, but that is fine if it turns
out they do not actually apply to the undelying message - which at that point <b><em>is</em></b>
known.</p>

<h2><a name="HowItWorks-Verification"></a>Verification</h2></div>


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