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lexicalRepresentation element

From: Arnold, Curt <Curt.Arnold@hyprotech.com>
Date: Tue, 28 Sep 1999 09:55:11 -0600
Message-ID: <61DAD58E8F4ED211AC8400A0C9B468731AAFAC@THOR>
To: "'www-xml-schema-comments@w3.org'" <www-xml-schema-comments@w3.org>
As it is currently formulated, the interpretation of the
lexicalRepresentation element is dependent on the ultimate ancestor type of
the datatype, though only an interpretation for datatypes derived from
"string" is formulated.  I think it would be simplify things to replace the
current functionality of lexicalRepresentation element with a <regex>
element that could be applied to the lexical space regardless of the base
class.  When a clear definition of the lexicalRepresention is formulated,
then it could be reintroduced in addition to the <regex> element.

I think part of the problems is that you are only allowing a mechanism to
inherit both the value space and the lexical space from the base type.  What
might be be a way to address the problem is to allow a derived class to
specify transforms that would map its lexical space into that of its base
class.  For example, if I wanted to declare a boolean datatype that used 0
and 1 instead of "true" and "false", it could be something like

<datatype name="intBoolean">
	<!--  I inherit the boolean data space -->
	<basetype name="boolean"/>
	<!-- match and replace would be regular expression translation,
first matching transform would take precedence -->
	<transform match="0" replace="true"/>	
	<transform match="1" replace="false"/>
Received on Tuesday, 28 September 1999 11:57:30 UTC

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