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> -----Original Message-----
> From: John Cowan [mailto:firstname.lastname@example.org]
> Sent: Friday, June 21, 2002 2:46 PM
> To: Dare Obasanjo
> Cc: John Cowan; Rick Taylor; email@example.com
> Subject: Re: [xml-dev] XML Schema to relaxNG xslt
> > does RELAX NG mimic restrictions (especially the nested ones) that
> > involve facets like xs:minInclusive, xs:maxInclusive?
> RNG can specify constraints on simple types,
RELAX NG can specify pattern constraints but I haven't seen the ability
to specify ranges which is what xs:minInclusive, xs:maxInclusive et al
do. Can I specify a type that is a date between 1990 and 2000 or a time
between 9:00AM and 5:00 PM in RELAX NG?
On looking at the tutorial it seems this could be done if a RELAX NG
implementation supported the W3C XML Schema Datatypes recommendation as
a type library and implemented the facets as datatype parameters.
However I don't see anything that implies that an implementation with
such functionality exists or is forthcoming.
> but not nested constraints.
> How does one restrict complex types in WXS?
A restriction of a complex type is a type that validates a subset of
what the base type does. An example is
<!-- base type -->
<xs:element name="numPosts" type="xs:integer" minOccurs="0"
<xs:element name="signature" type="xs:string" nillable="true" />
<xs:attribute name="firstSubscribed" type="xs:date" use="required" />
<xs:attribute name="mailReader" type="xs:string"/>
<!-- derived type -->
<xs:element name="numPosts" type="xs:integer" minOccurs="1" />
<xs:element name="signature" type="xs:string" nillable="false" />
<xs:attribute name="firstSubscribed" type="xs:date" use="optional" />
<xs:attribute name="mailReader" type="xs:string" fixed="Microsoft
> In the spec:
>Section 4.7, 3rd paragraph.
Funny enough I found the language in the spec as hard to parse as when I
first started reading the
W3C XML Schema Structures recommendation less than a year ago.
>In the tutorial:
Ahhh, much better. Too bad W3C XML Schema Primer doesn't do as complete
a job as the RELAX NG tutorial.
PITHY WORDS OF WISDOM
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