Avoid using // (especially since you have a key already set up so you
don't need to repeat the search over the whole document. Also you
usually have a better experience initially writing your code for a
command line or editor based engine rather than for a browser. Browsers
are not really designed to report errors.
This would be easier to do in two passes, but since you want it to run
in firefox which doesn't have a node-set() extension, here's I one-pass
solution that probably does what you want.
$ saxon a.xml a.xsl
<html>culture<br>
-----Deloria, Ella C.<br>
-----Rice, Julian<br>
texts<br>
-----Deloria, Ella C.<br>
-----Rice, Julian<br>
</html>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:key name = "topics" match = " topic " use = " . " />
<xsl:key name = "name" match = "author/name" use = "." />
<xsl:template match = "/" >
<html>
<xsl:for-each select =
"/sources/source/topics/topic[generate-id()=generate-id(key('topics',.))]
" >
<xsl:sort select = " . " />
<xsl:variable name = "currentTopic" select = " . "
/>
<xsl:value-of select = " $currentTopic " />
<br /><xsl:text> </xsl:text>
<xsl:for-each select =
"key('name',key('topics',$currentTopic)/../../authors
/ author /
name)[generate-id()=generate-id(key('name',.))]">
<xsl:sort select = " . " />
<xsl:text>-----</xsl:text>
<xsl:value-of select = "." />
<br /><xsl:text> </xsl:text>
</xsl:for-each>
</xsl:for-each>
</html>
</xsl:template>
</xsl:stylesheet>
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