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I am trying to explore the use of streaming with various grouping
approaches, mainly with Saxon 9.6 EE, but for comparison I also run
examples through the online version of Exselt http://exselt.net/demo.
So far, when I used <xsl:mode streamable="yes"/> to make the whole code use streaming Saxon threw an error on stylesheet compilation if a construct or expression breaking streamability rules was used (for instance "The group-adjacent expression is not motionless"). However with a test case using group-starting-with="record[foo = 'a']" Saxon does compile the stylesheet but then gives various warnings during the execution that " SXST0061: An error occurred matching pattern {record[foo = 'a']}: Navigation using child axis is not supported from a streamed input node". and produces a wrong transformation result. I understand the problem with that pattern and the "foo" child axis access but I wonder whether it should be found as an error during compilation, as in the other examples I tried. Exselt does run the stylesheet and produces the wanted result but I have no way of seeing whether it built a tree or not. Here are the samples, the stylesheet is <xsl:stylesheet version="3.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" exclude-result-prefixes="xs"> <xsl:mode streamable="yes"/> <xsl:output indent="yes"/> <xsl:template match="root"> <xsl:copy> <xsl:for-each-group select="record" group-starting-with="record[foo = 'a']"> <group> <xsl:copy-of select="current-group()"/> </group> </xsl:for-each-group> </xsl:copy> </xsl:template> </xsl:stylesheet> an input sample is <root>
<record>
<foo>a</foo>
<bar>1</bar>
</record>
<record>
<foo>b</foo>
<bar>2</bar>
</record>
<record>
<foo>a</foo>
<bar>3</bar>
</record>
<record>
<foo>b</foo>
<bar>4</bar>
</record>
<record>
<foo>a</foo>
<bar>5</bar>
</record>
<record>
<foo>a</foo>
<bar>6</bar>
</record>
<record>
<foo>c</foo>
<bar>7</bar>
</record>
</root>the output I want is <root>
<group>
<record>
<foo>a</foo>
<bar>1</bar>
</record>
<record>
<foo>b</foo>
<bar>2</bar>
</record>
</group>
<group>
<record>
<foo>a</foo>
<bar>3</bar>
</record>
<record>
<foo>b</foo>
<bar>4</bar>
</record>
</group>
<group>
<record>
<foo>a</foo>
<bar>5</bar>
</record>
</group>
<group>
<record>
<foo>a</foo>
<bar>6</bar>
</record>
<record>
<foo>c</foo>
<bar>7</bar>
</record>
</group>
</root>the one Saxon 9.6 EE gives is <root>
<group>
<record>
<foo>a</foo>
<bar>1</bar>
</record>
<record>
<foo>b</foo>
<bar>2</bar>
</record>
<record>
<foo>a</foo>
<bar>3</bar>
</record>
<record>
<foo>b</foo>
<bar>4</bar>
</record>
<record>
<foo>a</foo>
<bar>5</bar>
</record>
<record>
<foo>a</foo>
<bar>6</bar>
</record>
<record>
<foo>c</foo>
<bar>7</bar>
</record>
</group>
</root>but as I said, with various warnings that something went wrong, of the form Warning: on line 11 of test2015011607.xsl: SXST0061: An error occurred matching pattern {record[foo = 'a']}: Navigation using child axis is not supported from a streamed input node
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