[Bug 19504] [QT3TS] instanceof139

https://www.w3.org/Bugs/Public/show_bug.cgi?id=19504

--- Comment #14 from Jonathan Robie <jonathan.robie@gmail.com> ---
I just added this - please take a look and confirm that this solves the
problem.

<quote>
The judgement subtype-itemtype(Ai, Bi) determines if the ItemType Ai is a
subtype of the ItemType Bi. Ai is a subtype of Bi if and only if at least one
of the following conditions applies:

1. Ai and Bi are AtomicOrUnionTypes, and derives-from(Ai, Bi) returns true.

<add>
2. Ai and Bi are both [pure union types], and every type t in the transitive
membership of Ai is also in the transitive membership of Bi.
</add>

!!! SNIP !!!
</quote>

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Received on Thursday, 20 December 2012 21:53:24 UTC