Bug #4486: Attribute saxon:explain doesn't work - Saxon - Saxonica Developer Community

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Bug #4486

closed

Attribute saxon:explain doesn't work

Added by Michael Kay about 4 years ago. Updated over 3 years ago.

Status:

Closed

Priority:

Normal

Assignee:

Michael Kay

Category:

Diagnostics

Sprint/Milestone:

Start date:

2020-03-20

Due date:

% Done:

100%

Estimated time:

Legacy ID:

Applies to branch:

10, 9.9

Fix Committed on Branch:

10, 9.9

Fixed in Maintenance Release:

10.2, 9.9.1.8

Platforms:

Description

According to the documentation, it should be possible to say saxon:explain="yes" on xsl:template or xsl:function to get optimizer diagnostics for that template or function.

This isn't working, on either 9.9 or 10.0.

The basic code support is there (StyleElement.isExplaining()) but it's always returning false.

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Updated by Michael Kay about 4 years ago

XSLFunction and XSLTemplate both ignore unknown attributes in the Saxon namespace, so the triggering code in checkUnknownAttribute() is not being fired.

This is consistent with the spec (§3.2): "An implementation that does not recognize the name of an extension attribute, or that does not recognize its value, must perform the transformation as if the extension attribute were not present. As always, it is permissible to produce warning messages."

(I don't think we follow this rule in all cases; I think we sometimes reject an extension attribute if it has an invalid value, or if it's not allowed in a particular Saxon edition)

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Updated by Michael Kay about 4 years ago

Status changed from New to In Progress
Applies to branch 10, 9.9 added
Fix Committed on Branch 10, 9.9 added

I've fixed the code on the 9.9 and 10.0 branches so saxon:explain now works on xsl:function and xsl:template. The documentation needs changing to reflect the fact that the attribute is available only on these two elements.

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