Re: XML Validity and DTD dependance

/ Rich Salz <rsalz@datapower.com> was heard to say:
[...]
| I didn't do a full analysis, but a quick skim through the 3rd ed
| shows that many validity constraints are independant of a DTD.
|
| Some of the validity constraints are constraints on the DTD:
|         Unique Element Type Declaration
|         No Duplicate Types
|         ID Attribute Default
|         Unique Notation Name
| and some are constraints on the "XML document" itself:
|         Element Valid
|         Attribute Value Type
|         One ID per Element
|         Name token
|         Enumeration
|         Required attribute
|         Fixed Attribute Default
| If my document is fully defined by schema, our *out of band
| knowledge* then there is no reason why these constriants require
| a DTD.

I'm really confused. Do you want to standardize the format of "out of
band knowledge"? If not, then what sort of general purpose validator
could you write? It seems to me that you'd just have some application
constraints.

If you do want to standardize it, what format do you have in mind?

Here's an XML document:

  <para partno="3fourfive"/>

Is that document valid? How can you tell?

If you know that partno is supposed to be a NAME, you know its
invalid, but how did you know that?

                                        Be seeing you,
                                          norm

-- 
Norman.Walsh@Sun.COM / XML Standards Architect / Sun Microsystems, Inc.
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