Thanks, Ken for the reply. This answers my question.

On Sat, Apr 25, 2009 at 10:34 AM, G. Ken Holman
<gkholman@c...> wrote:
> At 2009-04-25 08:10 +0530, Mukul Gandhi wrote:
>>
>> =C2=A0I couldn't see provisions in the XML Schema languages (both 1.0 an=
d
>> 1.1) to have XML "comments" and "processing instructions" as part of
>> the validation requirements.
>>
>> Why are "comments" and PIs not considered XML Schema validation
>> primitives?
>
> I call these two constructs "XML annotations" though that is not an offic=
ial
> term for them, only a convenient pigeon hole or label for them.
>
> Schema languages constrain XML vocabularies and their content. =C2=A0Comm=
ents and
> processing instructions are not part of an XML vocabulary, only elements =
and
> attributes and their content.
>
> Annotations can be placed anywhere they are allowed in an XML document
> without violating the constraints on an XML vocabulary.
>
> You won't see constraints on comments and PIs in DTD, W3C Schema, RELAX-N=
G
> or NVDL semantics. =C2=A0I doubt any of the prototypical or bespoke XML
> vocabulary validation languages would constrain these either. =C2=A0I sup=
pose
> someone could dream up some validation semantics to constrain them, and
> implement them with something like Schematron. =C2=A0But that would be mo=
re like
> a "document writing constraint" rather than an XML vocabulary constraint.
>
>> Please pardon me, if I am missing something.
>
> http://www.w3.org/TR/xml/#syntax
> =C2=A0- Text consists of intermingled character data and markup
>
> http://www.w3.org/TR/xml/#sec-comments
> =C2=A0- They are not part of the document's character data; an XML
> =C2=A0 =C2=A0processor MAY, but need not, make it possible for an applica=
tion
> =C2=A0 =C2=A0to retrieve the text of comments
>
> http://www.w3.org/TR/xml/#sec-pi
> =C2=A0- PIs are not part of the document's character data, but MUST
> =C2=A0 =C2=A0be passed through to the application.
>
> I hope this helps.
>
> . . . . . . . . . Ken
>
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-- 
Regards,
Mukul Gandhi

From mike@s... Sat Apr 25 09:02:35 2009
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