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[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Question on streaming accumulator solely selecting at
 <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:map="http://www.w3.org/2005/xpath-functions/map" exclude-result-prefixes="xs map" version="3.0"> <xsl:mode streamable="yes"/> <xsl:global-context-item use-accumulators="type-count"/> <xsl:output method="text"/> <xsl:accumulator name="type-count" as="map(xs:string, xs:integer)" initial-value="map{}" streamable="yes"> <xsl:accumulator-rule match="product"> <xsl:sequence select="if (map:contains($value, @type)) then map:put($value, string(@type), $value(@type) + 1) else map:put($value, string(@type), 1)"/> </xsl:accumulator-rule> </xsl:accumulator> <xsl:template match="/"> <xsl:for-each select="*/*"> <xsl:message select="node-name(.)"/> </xsl:for-each> <xsl:value-of select="serialize(accumulator-after('type-count'), map{ 'method' : 'adaptive'})"/> </xsl:template> </xsl:stylesheet> Saxon 9.7 EE does not compile the stylesheet, indicating Error at xsl:accumulator-rule on line 15 column 41 of test2016010206.xsl: XTSE3430: The xsl:accumulator-rule/@select expression for a streaming accumulator must be motionless. Operand [@type, ...] of apply(...) selects streamed nodes in a context that allows arbitrary navigation (line 18) Why is the access to an attribute with `string(@type)` not motionless? When I fix the stylesheet with a `let` expression, as in <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:map="http://www.w3.org/2005/xpath-functions/map" exclude-result-prefixes="xs map" version="3.0"> <xsl:mode streamable="yes"/> <xsl:global-context-item use-accumulators="type-count"/> <xsl:output method="text"/> <xsl:accumulator name="type-count" as="map(xs:string, xs:integer)" initial-value="map{}" streamable="yes"> <xsl:accumulator-rule match="product"> <xsl:sequence select="let $type := string(@type) return if (map:contains($value, $type)) then map:put($value, $type, $value($type) + 1) else map:put($value, $type, 1)"/> </xsl:accumulator-rule> </xsl:accumulator> <xsl:template match="/"> <xsl:for-each select="*/*"> <xsl:message select="node-name(.)"/> </xsl:for-each> <xsl:value-of select="serialize(accumulator-after('type-count'), map{ 'method' : 'adaptive'})"/> </xsl:template> </xsl:stylesheet> the code compiles and runs fine. But I wonder why the multiple use of the same attribute causes an error, I thought during streaming of an element its attributes are always accessible. 
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