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https://issues.apache.org/jira/browse/XALANJ-2424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12562462#action_12562462
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Илья Казначеев commented on XALANJ-2424:
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BasisLibrary::nodeList2Iterator does seriously 'not smart' thing:
It attempts to appendChild() an attribute node into DocumentElement.
That's an obvious bag, but I'll now go farther and try to understand why
nodeList2Iterator is called in the first place: simply listing elements don't
cause that.
> set:distinct() over attribute list breaks XSLTC throwing HIERARCHY_REQUEST_ERR
> ------------------------------------------------------------------------------
>
> Key: XALANJ-2424
> URL: https://issues.apache.org/jira/browse/XALANJ-2424
> Project: XalanJ2
> Issue Type: Bug
> Components: XSLTC
> Affects Versions: 2.7.1, 2.7
> Environment: Linux, Sun java 1.6
> Reporter: Илья Казначеев
> Attachments: Process.jad, xml1.xml, xsl1.xsl
>
>
> If you do set:distinct over attribute list, XSLTC-compiled translet throws
> HIERARCHY_REQUEST_ERR exception.
> Exception is localised to point where set:distinct is called, even if it is
> assigned into a variable.
> Test case:
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
> xmlns:set="http://exslt.org/sets"; version="1.0">
> <xsl:output method="html" />
> <xsl:template match="/">
> <xsl:variable name="attrs"
> select="set:distinct(source/element/@attr)" />
> <html><body>
> <xsl:for-each select="$attrs">
> <xsl:value-of select="." />
> </xsl:for-each>
> </body></html>
> </xsl:template>
> </xsl:stylesheet>
> With xml
> <source>
> <element attr="val1" name="foobar" />
> <element attr="val2" name="bar" />
> <element attr="val2" name="baz" />
> <element attr="val3" name="baz" />
> </source>
> that will cause an Exception to be thrown when variable is assigned.
> My unedicated guess is that it tries to apply-templates over selected nodes
> into document in place where set:distinct is computed. This happens, as I see
> for different partially-serialized document, before variable's enclosing
> element is closed. I've disassembled the stylesheet but didn't understand
> much from there, it goes like this:
> // 30 66:invokeinterface #110 <Method org.w3c.dom.NodeList
> DOM.makeNodeList(DTMAxisIterator)>
> // 31 71:invokestatic #116 <Method org.w3c.dom.NodeList
> ExsltSets.distinct(org.w3c.dom.NodeList)>
> // 32 74:aload_0
> // 33 75:aload_1
> // 34 76:invokestatic #122 <Method DTMAxisIterator
> BasisLibrary.nodeList2Iterator(org.w3c.dom.NodeList,
> org.apache.xalan.xsltc.Translet, DOM)>
> // 35 79:new #126 <Class CachedNodeListIterator>
> // 36 82:dup_x1
> // 37 83:swap
> // 38 84:invokespecial #127 <Method void
> CachedNodeListIterator(DTMAxisIterator)>
> // 39 87:iload 4
> // 40 89:invokeinterface #41 <Method DTMAxisIterator
> DTMAxisIterator.setStartNode(int)>
> // 41 94:astore 9
> // 42 96:aload_3
> // 43 97:ldc1 #129 <String "html">
> // 44 99:dup2
> // 45 100:invokeinterface #14 <Method void
> SerializationHandler.startElement(String)>
> P.S. If said variable is located in prologue (not inside any xsl:template)
> the bug persists.
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