Bug #4619

XX Compiler failure with static parameters whose type has an occurrence indicator

Added by Michael Kay 3 months ago. Updated 2 days ago.

XX compiler
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#1 Updated by John Lumley 3 months ago

This is a puzzle... certainly there are cases of the XX compiler compiling the testdriver successfully - and that certainly contains static parameters used for conditional compilation.

Sent from my iPad

On 28 Jun 2020, at 15:18, Saxonica Developer Community wrote:

#2 Updated by John Lumley 3 months ago

  • Status changed from New to In Progress
  • Applies to JS Branch Trunk added

A minimal reproduction of the problem occurs with:

<xsl:stylesheet xmlns:xsl=""
   xmlns:xs="" exclude-result-prefixes="#all" version="3.0">

   <xsl:param name="xslt-uri" static="yes" as="xs:string?" select="'group-sales-sum-product.xsl'"/>


which fails in the static phase with as="xs:string?" but succeeds with as="xs:string"

#3 Updated by John Lumley 3 months ago

The strategy for handling type declarations on such static variables has been to wrap the expression in a casting function, for example:

<xsl:param name="length" as="xs:decimal" select="12+34"/>

involves an evaluation of the XPath expression 'xs:decimal(12+34)'. Unfortunately this has never been tried with a cardinality indicator, so the compiler has been trying to parse


which on encountering the ? operator, assumes a lookup and takes the left hand operator to be a child::xs:string term. In this case there is no context focus and hence the error.

#4 Updated by John Lumley 3 months ago

Patch committed, though there may be need to implement function conversion rules as a final solution

#5 Updated by Debbie Lockett 3 days ago

  • Assignee changed from John Lumley to Debbie Lockett
  • Applies to JS Branch deleted (Trunk)
  • Fix Committed on JS Branch 2.0 added

The code patch was committed to the saxon-js-enterprise git repo on 2020-06-29.

A test should be added (XSLT3 probably?), and then the bug can be closed.

#6 Updated by Debbie Lockett 2 days ago

  • Status changed from In Progress to Resolved

Added xslt3 test case static-031, so now closing.

#7 Updated by Michael Kay 2 days ago

  • Subject changed from XX Compiler fails to compile stylesheet containing static parameters to XX Compiler failure with static parameters whose type has an occurrence indicator

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