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perry
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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>
|
355 |
|
|
<rtexprvalue>false</rtexprvalue>
|
356 |
|
|
</attribute>
|
357 |
|
|
<attribute>
|
358 |
|
|
<name>select</name>
|
359 |
|
|
<required>true</required>
|
360 |
|
|
<rtexprvalue>true</rtexprvalue>
|
361 |
|
|
</attribute>
|
362 |
|
|
<attribute>
|
363 |
|
|
<name>context</name>
|
364 |
|
|
<required>false</required>
|
365 |
|
|
<rtexprvalue>true</rtexprvalue>
|
366 |
|
|
</attribute>
|
367 |
|
|
</tag>
|
368 |
|
|
<tag>
|
369 |
|
|
<name>stylesheet</name>
|
370 |
|
|
<tagclass>org.apache.taglibs.xtags.xpath.StylesheetTag</tagclass>
|
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 |
|
|
|