Possible defect in XOP and MTOM

Hi

I am reading www.w3.org/TR/xop10/ and it seems to me that something is missing in the following clause:


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3.1 Creating XOP Packages

To create a XOP Package from an Original XML Infoset: 

[...]

Identify within the Original XML Infoset the element information items to be optimized. To be optimized, the characters comprising the [children] of the element information item MUST be in the canonical form of xs:base64Binary (see [XML Schema Part 2: Datatypes Second Edition]3.2.16 base64Binary) and MUST NOT contain any whitespace characters, preceding, inline with or following the non-whitespace content. 

[...]
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I would assume that the first condition to be imposed is that the [children] of the element information item be all character information items.  For example, comment IIs and processing instruction IIs present among the [children] -- in any position -- should prevent the "optimization", as do the character IIs that are whitespace.  

(That an element II present among the [children] should also prevent the optimization is even more obvious.)

Perhaps this condition is kind-of implied by the use of the term "comprising" (instead of "among", say), but I think the condition should be stated more explicitly.

A similar problem exists in MTOM (clause 2.3.1).

Regards,

Alessandro Triglia
OSS Nokalva, Inc.