[Bug 24495] Missing posture for streamability of xsl:try

https://www.w3.org/Bugs/Public/show_bug.cgi?id=24495

--- Comment #3 from Michael Kay <mike@saxonica.com> ---
I believe the correct rules are:

The posture and sweep of the instruction are the first of the following that
applies:

If the select expression and/or sequence constructor of every xsl:catch element
is motionless, then the posture and sweep of the select expression and/or
sequence constructor of the xsl:try element (whichever is present);

Otherwise, roaming and free-ranging.

I have applied this change to the editor's draft, subject to WG approval.

(Note, we could in theory do better for try/catch, for example we could allow
the main try expression to be motionless and the catch clauses to be consuming.
But I don't think it's worth the effort.)

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