1<?xml version="1.0" encoding="ISO-8859-1"?> 2<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> 3 4 <!-- FileName: variable68 --> 5 <!-- Document: http://www.w3.org/TR/xslt --> 6 <!-- DocVersion: 19991116 --> 7 <!-- Section: 11.6 --> 8 <!-- Creator: David Marston --> 9 <!-- Purpose: Demonstrate various tests of nullness on local variables --> 10 11<xsl:output method="xml" indent="no" encoding="UTF-8"/> 12 13<xsl:template match="doc"> 14 <xsl:variable name="NotSet"/> 15 <xsl:variable name="String" select="'string'"/> 16 <xsl:variable name="nString" select="''"/> 17 <xsl:variable name="Node" select="a"/> 18 <xsl:variable name="nNode" select="b"/><!-- No element of that name in source. --> 19 <out> 20 <xsl:text>NotSet: </xsl:text> 21 <xsl:choose> 22 <xsl:when test="$NotSet = ''"><xsl:text>equals empty</xsl:text></xsl:when> 23 <xsl:when test="$NotSet != ''"><xsl:text>not empty</xsl:text></xsl:when> 24 <xsl:otherwise><xsl:text>neither</xsl:text></xsl:otherwise> 25 </xsl:choose> 26 <xsl:text> 27String: </xsl:text> 28 <xsl:choose> 29 <xsl:when test="$String = ''"><xsl:text>equals empty</xsl:text></xsl:when> 30 <xsl:when test="$String != ''"><xsl:text>not empty</xsl:text></xsl:when> 31 <xsl:otherwise><xsl:text>neither</xsl:text></xsl:otherwise> 32 </xsl:choose> 33 <xsl:text> 34nString: </xsl:text> 35 <xsl:choose> 36 <xsl:when test="$nString = ''"><xsl:text>equals empty</xsl:text></xsl:when> 37 <xsl:when test="$nString != ''"><xsl:text>not empty</xsl:text></xsl:when> 38 <xsl:otherwise><xsl:text>neither</xsl:text></xsl:otherwise> 39 </xsl:choose> 40 <xsl:text> 41Node: </xsl:text> 42 <xsl:choose> 43 <xsl:when test="$Node = ''"><xsl:text>equals empty</xsl:text></xsl:when> 44 <xsl:when test="$Node != ''"><xsl:text>not empty</xsl:text></xsl:when> 45 <xsl:otherwise><xsl:text>neither</xsl:text></xsl:otherwise> 46 </xsl:choose> 47 <xsl:text> 48nNode: </xsl:text> 49 <xsl:choose> 50 <xsl:when test="$nNode = ''"><xsl:text>equals empty</xsl:text></xsl:when> 51 <xsl:when test="$nNode != ''"><xsl:text>not empty</xsl:text></xsl:when> 52 <xsl:otherwise><xsl:text>neither</xsl:text></xsl:otherwise> 53 </xsl:choose> 54 </out> 55</xsl:template> 56 57 58 <!-- 59 * Licensed to the Apache Software Foundation (ASF) under one 60 * or more contributor license agreements. See the NOTICE file 61 * distributed with this work for additional information 62 * regarding copyright ownership. The ASF licenses this file 63 * to you under the Apache License, Version 2.0 (the "License"); 64 * you may not use this file except in compliance with the License. 65 * You may obtain a copy of the License at 66 * 67 * http://www.apache.org/licenses/LICENSE-2.0 68 * 69 * Unless required by applicable law or agreed to in writing, software 70 * distributed under the License is distributed on an "AS IS" BASIS, 71 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 72 * See the License for the specific language governing permissions and 73 * limitations under the License. 74 --> 75 76</xsl:stylesheet> 77