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<?xml version="1.0" standalone="no"?>
<!DOCTYPE s1 SYSTEM "../../style/dtd/document.dtd">
<!--
* Copyright 2001-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
-->
<!-- $Id: xsl_lang_design.xml 337884 2004-02-17 19:29:35Z minchau $ -->
<s1 title="lang() function">
<ul>
<li><link anchor="functionality">Functionality</link></li>
<li><link anchor="implementation">Implementation</link></li>
</ul>
<anchor name="functionality"/>
<s2 title="Functionality">
<p>The <code>xml:lang</code> can be used to determine the language for a node or
a node-set. The attribute can be used to store language-specific data in an
XML document:</p>
<source>
<phrases>
<greeting xml:lang="en">Hello!</greeting>
<greeting xml:lang="no">Hei!</greeting>
<greeting xml:lang="fr">Salut!</greeting>
<greeting xml:lang="es">Hola!</greeting>
<greeting xml:lang="de">Sweinhund!</greeting>
</phrases>
</source>
<p>The XSL stylesheet can use the <code>lang()</code> function to select the
element with the desired language:</p>
<source>
<xsl:template match="greeting">
<xsl:if test="lang("de")>
<xsl:value-of select="."/>
<xsl:text> Grossglucklicher wunche!</xsl:text>
</xsl:if>
</xsl:template>
</source>
</s2> <anchor name="implementation"/>
<s2 title="Implementation">
<p>The DOM interface has been given a method that returns the language for
a given node. The language is returned as a string (on whatever format is
used in the XML document - should be iso), and may be null if no language is
defined.</p>
<source>
public String DOM.getLanguage(int node);
</source>
<p>The BasisLibrary class has a static method that will compare the language
of the context node with some other language and return the result as a
boolean.</p>
<source>
public static boolean BasisLibrary.testLanguage(String language, DOM dom, int node);
</source>
<p>The compiled code for the <code>lang()</code> method calls this method in the
BasisLibrary and leaves the result on the stack for the calling element.</p>
</s2>
</s1>
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