New schema spec

John Cowan cowan at
Mon May 10 21:52:02 BST 1999

Rick Jelliffe wrote:

> P.S. Am I the only one freaking out that the current Schema draft is not
> compatible with XML 1.0?  It introduces a new class "nearly well-formed"
> which is not WF: thus all current XML processors will treat these
> documents in error.

You are not.  I am preparing a blast which will shred this nonsense
once and for all ^W^W^W^W^W^W^W^W^W^W well-reasoned comment explaining
to the Schema WG the error of their ways.  I'll post it here when
done as well as to the official comments list.

> This is a terrible excercise in backwards
> incompatability--all existing XML processors will be incompatible: the
> only reason they have this class is because they try to cram into the
> Schema spec some way to declare entities (I thought that XLink was our
> way to improve entities: now we have 3 ways to do them...Yikes).  It
> reduces XSchema's credibility a lot--it makes it look like there is a
> petty dislike of XML's markup declaration syntax which was so strong
> that it overweighed the requirement to conform to XML 1.0 WF rules.

Furthermore, it means that a document as read by a 1.0-compliant
read-all-entities non-validating parser may have different *content*
from one read by a schema-reading non-schema-validating parser,
if both external DTD and schema are specified, and they have
different definitions for the same entities.

XLink fully displaces entities only if the "data:" URL scheme
(RFC 2397) is widely supported; this is the URL equivalent of
internal entities.  (More accurately, it allows external
entities that are represented internally.)

John Cowan		cowan at
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)

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