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This is in the context of xsl:number with @level="any".
Reading the XSLT 2.0 recommendation it looks like @from is allowed to be "/" to indicate a document node. Yet I get empty sequences whenever I try it with Saxon 8.8. I get the behaviour I expect with @from="/*". Here's an example, which uses processing instructions to show a case where / has more than one child. Document:
<?xml version="1.0" encoding="UTF-8"?>
<?thing?>
<top>
<?thing?>
<child>
<?thing?>
<child><?thing?></child>
</child>
<child>
<?thing?>
</child>
</top>
<?thing?>Stylesheet: <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"> <xsl:template match="processing-instruction(thing)"> <xsl:message> <xsl:text>This thing gets xsl:number "</xsl:text> <xsl:number count="processing-instruction('thing')" from="/" level="any"/> <xsl:text>" from / and xsl:number "</xsl:text> <xsl:number count="processing-instruction('thing')" from="/*" level="any"></xsl:number> <xsl:text>" from /*.</xsl:text> </xsl:message> <xsl:apply-templates></xsl:apply-templates> </xsl:template> </xsl:stylesheet> Output: This thing gets xsl:number "" from / and xsl:number "" from /*. This thing gets xsl:number "" from / and xsl:number "1" from /*. This thing gets xsl:number "" from / and xsl:number "2" from /*. This thing gets xsl:number "" from / and xsl:number "3" from /*. This thing gets xsl:number "" from / and xsl:number "4" from /*. This thing gets xsl:number "" from / and xsl:number "5" from /*.
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