Re: DTDs are parts of documents but schemas are paired with documents

> Here is the proposed modified
> text:

This mostly addresses the issue, but...

>   We assume that an instance of the data model is derived from an
>   instance of the XML Information Set after XML Schema validation.
>   Such an instance is called a ``PSV Infoset'', for post
>   schema-validated Infoset.
> 
>   Schema information may be associated with a document in two ways.  A
>   document may refer directly to a DTD, and a document may be paired
>   with an XML Schema, which may be derived from one or more XML Schema
>   documents.  It is also possible for an XML document to have no DTD or
>   associated schema, i.e., it is ``schemaless''.  For a document,
>   schema pair, the PSV Infoset provides the schema.  For a document
>   that refers directly to a DTD, we assume a mapping from the DTD to
>   an equivalent schema is provided,

What does "an equivalent schema" mean? I suggest you leave
DTDs out of the discussion altogether; they're not relevant.
The infoset and xpath specs make it clear that DTD info
is intrinsic to a document and it's consumed in determining
the document's infoset.

>   and the PSV Infoset provides this
>   equivalent schema.  For a schemaless document, a default schema is
>   provided by the data model, and we specify in this document that
>   default schema.  In all three cases, a schema can be provided for
>   the input document and the corresponding data-model instance.

Also, there is still text in the spec that suggests that
schemas are intrinsic to documents; e.g.:

  6 Example

        We use the following XML document [...]

        The XML schema for this document is: 

*the* XML Schema, as if there's exactly one. Please
change to:

	This document is schema-valid w.r.t. the following schema:

Oops... there's more:

	For this example, we chose an XML document that
	includes an XML Schema ...

change to:

	For this example, we chose and XML document and
	an XML Schema ...


-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/

Received on Thursday, 12 April 2001 10:36:27 UTC