[Bug 19659] New: [XSLT 3.0] error in streamability rules for ./x

https://www.w3.org/Bugs/Public/show_bug.cgi?id=19659

          Priority: P2
            Bug ID: 19659
          Assignee: mike@saxonica.com
           Summary: [XSLT 3.0] error in streamability rules for ./x
        QA Contact: public-qt-comments@w3.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: mike@saxonica.com
          Hardware: PC
            Status: NEW
           Version: Last Call drafts
         Component: XSLT 3.0
           Product: XPath / XQuery / XSLT

There is an error (or at any rate, a serious limitation) in the streamability
rules for relative path expressions. The spec (section 19.3.7, RelativePathExpr
[35]) says that if the first step of the path expression is motionless, then
the path expression is motionless. 

Consider the expression ./x, or equivalents such as (. treat as node())/x.

The syntactic context of the LHS of "/" is a navigation context; "." in a
navigation context is free-ranging; therefore ./x is free-ranging.

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