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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN" "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">
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<taglib>
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<tlibversion>1.0</tlibversion>
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<jspversion>1.1</jspversion>
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<shortname>xtags</shortname>
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<uri>http://jakarta.apache.org/taglibs/xtags-1.0</uri>
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<info>XTags is a JSP tag library for working with XSLT and XPath.
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XTags lets you navigate, process and style XML documents directly in JSP.
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XTags makes heavy use of the XPath expression language.
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For a good tutorial on XPath you could try the either the
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Zvon tutorial or the
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specification.
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XTags is currently built on top of dom4j the
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flexible open source XML framework for the Java platform.
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Though increasingly XTags will use a pluggable XPath engine to support
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the travesal of DOM and Java Beans too.
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To begin with you need to parse an XML document from somewhere.
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You can parse a variety of sources of XML documents from local resources,
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the output of JSP or external web services.
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You can parse the body of the tag
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<xtags:parse>
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<root>
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<child/>
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</root>
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</xtags:parse>
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Or parse an absolute URL via the "url" attribute
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<xtags:parse url="http://something.com"/>
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You can parse a web app resource using an absolute URI relative to the web-app
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context using the "uri" attribute
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<xtags:parse uri="/data/foo.xml"/>
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Or you can use a URI relative to the the current JSP file
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<xtags:parse uri="foo.xml"/>
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Then for more complex
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requirements such as parsing the output of a piece of JSP, you can do the following (provided you are using a JSP 1.2 container)
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<xtags:parse>
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<jsp:include page="foo.jsp"/>
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</xtags:parse>
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Until then you can use the IO tag library to make these requests such as
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<xtags:parse>
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<io:request url="/foo.jsp"/>
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</xtags:parse>
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Though the above would result in a seperate HTTP request which would loose
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all page, request and session scope state.
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So if it must be in the same request the following should work
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though care should be taken to avoid scripting variable clashes
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<xtags:parse>
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<%@ include file="/foo.jsp" %>
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</xtags:parse>
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To parse the output of an XML-RPC (or SOAP) call, using the IO taglib
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you could do the following.
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<xtags:parse>
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<io:xmlrpc url="/xmlrpc_echo.jsp">
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<io:pipe>
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<methodCall>
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<methodName>examples.getStateName</methodName>
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<params>
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<param>
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<value><i4>41</i4></value>
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</param>
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</params>
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</methodCall>
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</io:pipe>
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</io:xmlrpc>
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</xtags:parse>
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Once you have a document parsed you can navigate around its structure using XPath
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expressions in a similar manner to that used in XSLT.Loops are as follows (an optional variable id can be specified to define a
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scriptlet expression inside the loop):-
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<xtags:forEach select="expression">
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...
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</xtags:forEach>
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Simple conditional branching is:-
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<xtags:if test="booeanExpression">
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...
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</xtags:if>
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More complex conditional branching is:-
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<xtags:choose>
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<xtags:when test="booeanExpression">
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...
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</xtags:when>
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<xtags:when test="booeanExpression2">
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...
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</xtags:when>
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<xtags:otherwise>
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...
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</xtags:otherwise>
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</xtags:choose>
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Expression evaluation
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<xtags:valueOf select="expression"/>
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Defining scriptlet variables
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<xtags:variable id="variableName" select="expression"/>
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All these tags are very similar to their XSLT equivalents, so anyone who's
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done XSLT before should find them familiar.
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There's also an <xtags:style> tag which performs complete XSL transform
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in one tag.
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Accessing JSP scopes from XPathXPath expressions can use variables with the syntax $foo.
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XTags binds these variables to either page/request/session/application scope
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attributes or request parameters which allows xtags to be used as a
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conditional logic scripting language too - even without the existence of XML
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documents.
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A prefix can be used to denote the exact JSP scope from which a variable comes
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from such as $request:foo to denote request scope.
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There now follows a full breakdown of all the current JSP scopes
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$foomaps to pageContext.findAttribute("foo")$page:foomaps to page scope$request:foomaps to request scope$session:foomaps to session scope$app:foomaps to application scope$param:foomaps to request.getParameter("foo")$initParam:foomaps to request.getInitParameter("foo")$cookie:foomaps to the cookie's value for name foo$header:foomaps to request.getHeader("foo") For example, the following JSP would branch logically based on the value of
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the (say) request parameter "param":-
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<xtags:choose>
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<xtags:when test="$param='a'">
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current param is 'a'
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</xtags:when>
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<xtags:when test="$param='b'">
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current param is 'b'
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</xtags:when>
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<xtags:otherwise>
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no valid param selected
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</xtags:otherwise>
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</xtags:choose>
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XTags even supports the <xtags:stylesheet> <xtags:template> and
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<xtags:applyTemplates> tags from XSLT too though the body of a template must
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be an Action object or a seperate JSP file.
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</info>
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<tag>
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<name>style</name>
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<tagclass>org.apache.taglibs.xtags.xslt.StyleTag</tagclass>
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<bodycontent>JSP</bodycontent>
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<attribute>
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<name>document</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>xml</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>xmlReader</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>xmlSource</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>xsl</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>xslReader</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>xslSource</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>result</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>writer</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>outputMethod</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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</tag>
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<tag>
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<name>param</name>
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<tagclass>org.apache.taglibs.xtags.xslt.ParamTag</tagclass>
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<bodycontent>JSP</bodycontent>
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<attribute>
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<name>name</name>
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<required>true</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>value</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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</tag>
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<tag>
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<name>parse</name>
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<tagclass>org.apache.taglibs.xtags.xpath.ParseTag</tagclass>
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<teiclass>org.apache.taglibs.xtags.xpath.ParseTagExtraInfo</teiclass>
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<bodycontent>JSP</bodycontent>
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<attribute>
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<name>id</name>
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<required>false</required>
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<rtexprvalue>false</rtexprvalue>
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</attribute>
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<attribute>
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<name>uri</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>url</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>reader</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>validate</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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</tag>
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<tag>
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<name>valueOf</name>
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<tagclass>org.apache.taglibs.xtags.xpath.ValueOfTag</tagclass>
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<bodycontent>empty</bodycontent>
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<attribute>
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<name>select</name>
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<required>true</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>context</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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</tag>
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<tag>
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<name>forEach</name>
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<tagclass>org.apache.taglibs.xtags.xpath.ForEachTag</tagclass>
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<teiclass>org.apache.taglibs.xtags.xpath.ForEachTagExtraInfo</teiclass>
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<bodycontent>JSP</bodycontent>
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<attribute>
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<name>select</name>
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<required>true</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>sort</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>distinct</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>ascending</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>context</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>id</name>
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<required>false</required>
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<rtexprvalue>false</rtexprvalue>
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</attribute>
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<attribute>
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<name>type</name>
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<required>false</required>
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<rtexprvalue>false</rtexprvalue>
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</attribute>
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</tag>
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<tag>
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<name>choose</name>
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<tagclass>org.apache.taglibs.xtags.xpath.ChooseTag</tagclass>
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<bodycontent>JSP</bodycontent>
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</tag>
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<tag>
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<name>when</name>
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<tagclass>org.apache.taglibs.xtags.xpath.WhenTag</tagclass>
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<bodycontent>JSP</bodycontent>
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<attribute>
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<name>test</name>
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<required>true</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>context</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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</tag>
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<tag>
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<name>otherwise</name>
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<tagclass>org.apache.taglibs.xtags.xpath.OtherwiseTag</tagclass>
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<bodycontent>JSP</bodycontent>
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</tag>
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<tag>
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<name>break</name>
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<tagclass>org.apache.taglibs.xtags.xpath.BreakTag</tagclass>
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<bodycontent>empty</bodycontent>
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</tag>
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<tag>
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<name>if</name>
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<tagclass>org.apache.taglibs.xtags.xpath.IfTag</tagclass>
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<bodycontent>JSP</bodycontent>
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<attribute>
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<name>test</name>
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<required>true</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>context</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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</tag>
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<tag>
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<name>variable</name>
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<tagclass>org.apache.taglibs.xtags.xpath.VariableTag</tagclass>
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<teiclass>org.apache.taglibs.xtags.xpath.VariableTagExtraInfo</teiclass>
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<bodycontent>empty</bodycontent>
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<attribute>
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<name>id</name>
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<required>true</required>
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<rtexprvalue>false</rtexprvalue>
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</attribute>
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<attribute>
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<name>type</name>
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<required>false</required>
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<rtexprvalue>false</rtexprvalue>
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</attribute>
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<attribute>
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<name>select</name>
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<required>true</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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<attribute>
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<name>context</name>
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<required>false</required>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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</tag>
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<tag>
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369
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<name>stylesheet</name>
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370
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<tagclass>org.apache.taglibs.xtags.xpath.StylesheetTag</tagclass>
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|
371
|
<bodycontent>JSP</bodycontent>
|
|
372
|
<attribute>
|
|
373
|
<name>context</name>
|
|
374
|
<required>false</required>
|
|
375
|
<rtexprvalue>true</rtexprvalue>
|
|
376
|
</attribute>
|
|
377
|
</tag>
|
|
378
|
<tag>
|
|
379
|
<name>template</name>
|
|
380
|
<tagclass>org.apache.taglibs.xtags.xpath.TemplateTag</tagclass>
|
|
381
|
<bodycontent>JSP</bodycontent>
|
|
382
|
<attribute>
|
|
383
|
<name>match</name>
|
|
384
|
<required>true</required>
|
|
385
|
<rtexprvalue>true</rtexprvalue>
|
|
386
|
</attribute>
|
|
387
|
<attribute>
|
|
388
|
<name>mode</name>
|
|
389
|
<required>false</required>
|
|
390
|
<rtexprvalue>true</rtexprvalue>
|
|
391
|
</attribute>
|
|
392
|
<attribute>
|
|
393
|
<name>avt</name>
|
|
394
|
<required>false</required>
|
|
395
|
<rtexprvalue>true</rtexprvalue>
|
|
396
|
</attribute>
|
|
397
|
<attribute>
|
|
398
|
<name>action</name>
|
|
399
|
<required>false</required>
|
|
400
|
<rtexprvalue>true</rtexprvalue>
|
|
401
|
</attribute>
|
|
402
|
</tag>
|
|
403
|
<tag>
|
|
404
|
<name>applyTemplates</name>
|
|
405
|
<tagclass>org.apache.taglibs.xtags.xpath.ApplyTemplatesTag</tagclass>
|
|
406
|
<bodycontent>JSP</bodycontent>
|
|
407
|
<attribute>
|
|
408
|
<name>select</name>
|
|
409
|
<required>false</required>
|
|
410
|
<rtexprvalue>true</rtexprvalue>
|
|
411
|
</attribute>
|
|
412
|
<attribute>
|
|
413
|
<name>mode</name>
|
|
414
|
<required>false</required>
|
|
415
|
<rtexprvalue>true</rtexprvalue>
|
|
416
|
</attribute>
|
|
417
|
</tag>
|
|
418
|
<tag>
|
|
419
|
<name>element</name>
|
|
420
|
<tagclass>org.apache.taglibs.xtags.xpath.ElementTag</tagclass>
|
|
421
|
<bodycontent>JSP</bodycontent>
|
|
422
|
<attribute>
|
|
423
|
<name>name</name>
|
|
424
|
<required>true</required>
|
|
425
|
<rtexprvalue>true</rtexprvalue>
|
|
426
|
</attribute>
|
|
427
|
</tag>
|
|
428
|
<tag>
|
|
429
|
<name>attribute</name>
|
|
430
|
<tagclass>org.apache.taglibs.xtags.xpath.AttributeTag</tagclass>
|
|
431
|
<bodycontent>JSP</bodycontent>
|
|
432
|
<attribute>
|
|
433
|
<name>name</name>
|
|
434
|
<required>true</required>
|
|
435
|
<rtexprvalue>true</rtexprvalue>
|
|
436
|
</attribute>
|
|
437
|
</tag>
|
|
438
|
<tag>
|
|
439
|
<name>output</name>
|
|
440
|
<tagclass>org.apache.taglibs.xtags.xpath.OutputTag</tagclass>
|
|
441
|
<bodycontent>JSP</bodycontent>
|
|
442
|
<attribute>
|
|
443
|
<name>method</name>
|
|
444
|
<required>false</required>
|
|
445
|
<rtexprvalue>true</rtexprvalue>
|
|
446
|
</attribute>
|
|
447
|
<attribute>
|
|
448
|
<name>indent</name>
|
|
449
|
<required>false</required>
|
|
450
|
<rtexprvalue>true</rtexprvalue>
|
|
451
|
</attribute>
|
|
452
|
<attribute>
|
|
453
|
<name>omitXmlDeclaration</name>
|
|
454
|
<required>false</required>
|
|
455
|
<rtexprvalue>true</rtexprvalue>
|
|
456
|
</attribute>
|
|
457
|
</tag>
|
|
458
|
<tag>
|
|
459
|
<name>copy</name>
|
|
460
|
<tagclass>org.apache.taglibs.xtags.xpath.CopyTag</tagclass>
|
|
461
|
<bodycontent>JSP</bodycontent>
|
|
462
|
<attribute>
|
|
463
|
<name>select</name>
|
|
464
|
<required>true</required>
|
|
465
|
<rtexprvalue>true</rtexprvalue>
|
|
466
|
</attribute>
|
|
467
|
<attribute>
|
|
468
|
<name>context</name>
|
|
469
|
<required>false</required>
|
|
470
|
<rtexprvalue>true</rtexprvalue>
|
|
471
|
</attribute>
|
|
472
|
</tag>
|
|
473
|
<tag>
|
|
474
|
<name>copyOf</name>
|
|
475
|
<tagclass>org.apache.taglibs.xtags.xpath.CopyOfTag</tagclass>
|
|
476
|
<bodycontent>JSP</bodycontent>
|
|
477
|
<attribute>
|
|
478
|
<name>select</name>
|
|
479
|
<required>true</required>
|
|
480
|
<rtexprvalue>true</rtexprvalue>
|
|
481
|
</attribute>
|
|
482
|
<attribute>
|
|
483
|
<name>context</name>
|
|
484
|
<required>false</required>
|
|
485
|
<rtexprvalue>true</rtexprvalue>
|
|
486
|
</attribute>
|
|
487
|
</tag>
|
|
488
|
<tag>
|
|
489
|
<name>context</name>
|
|
490
|
<tagclass>org.apache.taglibs.xtags.xpath.ContextTag</tagclass>
|
|
491
|
<bodycontent>JSP</bodycontent>
|
|
492
|
<attribute>
|
|
493
|
<name>select</name>
|
|
494
|
<required>true</required>
|
|
495
|
<rtexprvalue>true</rtexprvalue>
|
|
496
|
</attribute>
|
|
497
|
<attribute>
|
|
498
|
<name>context</name>
|
|
499
|
<required>false</required>
|
|
500
|
<rtexprvalue>true</rtexprvalue>
|
|
501
|
</attribute>
|
|
502
|
</tag>
|
|
503
|
<tag>
|
|
504
|
<name>remove</name>
|
|
505
|
<tagclass>org.apache.taglibs.xtags.xpath.RemoveTag</tagclass>
|
|
506
|
<bodycontent>empty</bodycontent>
|
|
507
|
<attribute>
|
|
508
|
<name>select</name>
|
|
509
|
<required>true</required>
|
|
510
|
<rtexprvalue>true</rtexprvalue>
|
|
511
|
</attribute>
|
|
512
|
</tag>
|
|
513
|
<tag>
|
|
514
|
<name>add</name>
|
|
515
|
<tagclass>org.apache.taglibs.xtags.xpath.AddTag</tagclass>
|
|
516
|
<bodycontent>jsp</bodycontent>
|
|
517
|
<attribute>
|
|
518
|
<name>before</name>
|
|
519
|
<required>false</required>
|
|
520
|
<rtexprvalue>true</rtexprvalue>
|
|
521
|
</attribute>
|
|
522
|
<attribute>
|
|
523
|
<name>after</name>
|
|
524
|
<required>false</required>
|
|
525
|
<rtexprvalue>true</rtexprvalue>
|
|
526
|
</attribute>
|
|
527
|
</tag>
|
|
528
|
<tag>
|
|
529
|
<name>replace</name>
|
|
530
|
<tagclass>org.apache.taglibs.xtags.xpath.ReplaceTag</tagclass>
|
|
531
|
<bodycontent>jsp</bodycontent>
|
|
532
|
</tag>
|
|
533
|
</taglib>
|
|
534
|
|
|
535
|
|
|
536
|
|
|
537
|
|
|
538
|
|
|
539
|
|
|
540
|
|
|
541
|
|
|
542
|
|
|
543
|
|
|
544
|
|
|
545
|
|
|
546
|
|
|
547
|
|
|
548
|
|
|
549
|
|
|
550
|
|
|
551
|
|
|
552
|
|
|
553
|
|
|
554
|
|
|
555
|
|