如何在xslt中解码base64Binary-to-string

Question

您好我正在尝试将我的Base64数据转换为xslt中的字符串，但无法这样做。

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="2.0" 
                xmlns:xs="http://www.w3.org/2001/XMLSchema"
                xmlns:saxon="http://saxon.sf.net/">

  <xsl:template match="Data">  
    <xsl:element name="fos1">
      <xsl:value-of select="(saxon:base64Binary-to-string(
                             xs:base64Binary("Data"), 
                             "UTF8"))"/>       
    </xsl:element>

  </xsl:template>
</xsl:stylesheet>

我有一个xml文件，其中我存储了base64数据，如下面的代码

    <?xml version="1.0" encoding="UTF-8"?>
<Data>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</Data>

Answer 1

调用xs:base64Binary("Data")尝试从字符串“Data”创建base-64值，该字符串不是合法的base-64字符串。因此，您应该收到一条错误消息。嗯。你没有提到错误信息;你没有解释“无法做到”究竟是什么意思。下次，提供更多信息，好吗？

如果要将函数应用于Data元素的字符串值，请记住，您正在位于与该元素匹配的模板中的表达式中进行调用。您几乎肯定希望将当前表达式中的调用替换为xs:base64Binary(.)。