additional Spec Schema wording

[Karsten Riemer <Karsten.Riemer@East.Sun.COM>]

To match and expand the wording in the executive summary,
here are two reworded paragraphs (1.1.1. and 1.1.2)
Again, please comment,

1.1.1	UML Specification Schema
The UML Specification Schema is a semantic subset of the metamodel behind UMM
as specified in UN/CEFACT TMWG's N90, expressed as a standalone UML profile.
The UML Specification Schema guarantees that a XML Specification Document is
analytically, semantically and functionally equivalent to one arrived at by
modeling the same subset through the use of UMM.

1.1.2	DTD Specification Schema
The DTD Specification Schema is an isomorphic definition of the UML
Specification Schema. The DTD Specification Schema seeks to guarantee that a
XML Specification Document is analytically, semantically and functionally
equivalent to a UML Specification Model of the same business process. This
version of the specification is expressed as a DTD, and some of the
constraints may need to be stated separately, in plain text. It is the intent
to migrate to W3C schema, as soon as it becomes available as a standard. At
that point such constraints, where possible, will be built into the schema.