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[Bug 2388] Required static error checking unduly constraints implementations

From: <bugzilla@wiggum.w3.org>
Date: Wed, 19 Oct 2005 19:42:38 +0000
To: public-qt-comments@w3.org
Message-Id: <E1ESJpe-0003bg-Ck@wiggum.w3.org>


           Summary: Required static error checking unduly constraints
           Product: XPath / XQuery / XSLT
           Version: Working drafts
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: P2
         Component: XSLT 2.0
        AssignedTo: mike@saxonica.com
        ReportedBy: terje@in-progress.com
         QAContact: public-qt-comments@w3.org

Requiring that conforming XSLT processors must detect and signal static errors before execution 
imposes severe constraints on implementations that will disallow certain optimizations and 
execution models.

For example, some XSLT  implementations may minimize latency (the delay before generating the 
first output) by performing on-demand analysis or compilation of template rules as they are 
applied, or by dynamically evaluate/interpret a simplified stylesheet module without compiling it 
or first performing static analysis.

Proposed solution: Turn static error checking into an optional feature. An XSLT processor with a 
Static Error Checking feature signals all static errors in a style sheet before processing any 
documents. A Basic XSLT processor without static error checking would detect and signal static 
errors at the latest as if they were dynamic errors, but might signal static errors earlier depending 
on the implementation.

Style sheet designers would then be able to use a processor with static error checking during 
debugging, while e.g. web browsers and other optimized real-time processors could bypass static 
error checking for speed and to minimize latency.

-- Terje
Received on Wednesday, 19 October 2005 19:42:45 UTC

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