RE: [xml-dev] XML Schema Simple Type Definitions

["CHIUSANO, Joseph" <JCHIUSANO@lmi.org>]

Title: RE: [xml-dev] XML Schema Simple Type Definitions

Thank you for your feedback - please see below:

<Snip>
By specifying fixed="true" you are saying that the value for this type is
fixed, and that value is "true". Is that what you want, or are you trying to
define an enumeration consisting of a fixed set of tokens? If it is the
latter, you might try:
</Snip>

*** Actually, by using fixed on a facet (as was done here), it makes the facet value a constant.  This ensures that any types that are derived from this type cannot change the value of the facet.  What I am trying to do is actually unrelated to enumerations - I'd like to simply declare a simple type based on an existing simple type, without using restriction.

Thanks,
Joe

> **************************************************************************
>   Joseph M. Chiusano
>   Logistics Management Institute
>   2000 Corporate Ridge
>   McLean, VA 22102
>   Email: jchiusano@lmi.org
>   Tel: 571.633.7722
> **************************************************************************
>

-----Original Message-----
From: Ramesh Gupta [mailto:ramesh@enode.com]
Sent: Wednesday, February 06, 2002 6:21 PM
To: xml-dev@lists.xml.org
Subject: Re: [xml-dev] XML Schema Simple Type Definitions

on 2/6/02 2:48 PM, CHIUSANO, Joseph at JCHIUSANO@lmi.org wrote:

> I am using this simple type for several local elements.  I would also like to
> declare another simple type (for example, called "SomeNewCodeType") which will
> also be string length 5.  I can certainly declare it as follows:
>
> <xsd:simpleType name = "SomeNewCodeType">
>   <xsd:restriction base = "xsd:string">
>       <xsd:maxLength value = "5" fixed = "true"/>
>   </xsd:restriction>
> </xsd:simpleType>
>
> However, I'd like to define the "SomeNewCodeType" simple type as type
> "String5VariableType" if possible.  The only way I see that this can be done
> is by declaring a restriction with a base type of "String5VariableType" and
> then specifying a facet such as maxInclusive of "99999" (to have something
> listed as a restriction), or perhaps a regular expression - but this seems
> awful kludgy.

By specifying fixed="true" you are saying that the value for this type is
fixed, and that value is "true". Is that what you want, or are you trying to
define an enumeration consisting of a fixed set of tokens? If it is the
latter, you might try:

<simpleType name="SomeNewCodeType">
    <restriction base="NCName">
        <enumeration value="Foo"/>
        <enumeration value="Bar"/>
        ...
    </restriction>
</simpleType>

If, on the other hand, the value is numeric, for example, a 32-bit hex value
preceded by a # sign, you may define the type as:

<simpleType name="Hex32">
    <restriction base="string">
        <length value="9"/>
        <maxLength value="9"/>
        <minLength value="9"/>
        <pattern value="#[0-9a-fA-F]{8}"/>
    </restriction>
</simpleType>

There is nothing kludgy about using facets that include regular expressions.
It all depends on what you want the end result to be.

Hope this helps.

Ramesh

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