W3C home > Mailing lists > Public > xmlschema-dev@w3.org > April 2001

Re: [Moderator Action] XML schema question - to anybody who can help.

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 12 Apr 2001 18:40:26 +0100
To: Michael_Fishman@i2.com
Cc: "xmlschema-dev@w3.org" <xmlschema-dev@w3.org>
Message-ID: <f5bd7ai9fud.fsf@cogsci.ed.ac.uk>
Michael_Fishman@i2.com writes:

> To anybody who can help.
> 
> I am trying to convert from DTD to XML schema and having this problem:
> In DTD I had a bunch of attributes defined this way:
> ---------------------------------------------------------------------------
> <!ENTITY % X_NAME "Length CDATA #FIXED '70'
>      Truncate CDATA #FIXED 'Allowed' ">
> 
> <!ENTITY % X_ZONECODE "Length CDATA #FIXED '8'
>                        Case CDATA #FIXED 'Upper' ">
> -----------------------------------------------------------------------------
> That was defined in a separate module and then in dtd module itself it's
> been used like this:
> 
> <!ELEMENT %Zn_cd;  (#PCDATA )>
> <!ATTLIST %Zn_cd;  %X_ZONECODE; >
> 
> <!ELEMENT %Zn_Desc;  (#PCDATA )>
> <!ATTLIST %Zn_Desc;  %X_NAME; >
> As a result of it I can reuse attribute groups defined by X_ names and,
> what is even more important, #FIXED allowed me not to specify these
> attributes in XML instance file - they've been taken from DTD.
> 
> In XML schema I am trying to do a similar thing:
> ---------------------------------------------------------------------------------------
>  <xsd:attributeGroup name = "X_ZONECODE">
>   <xsd:attribute name = "Length" use="fixed" value="8" type
> = "xsd:string"/>
>   <xsd:attribute name = "Case" use = "fixed" value = "Upper" type
> = "xsd:string"/>
>  </xsd:attributeGroup>
> 
>  <xsd:attributeGroup name = "X_NAME">
>   <xsd:attribute name = "Length" use = "fixed" value = "70" type
> = "xsd:string"/>
>   <xsd:attribute name = "Truncate" use = "fixed" value = "Allowed" type
> = "xsd:string"/>
>  </xsd:attributeGroup>
> 
>  <xsd:complexType name = "ZoneType">
>   <xsd:sequence>
>    <xsd:element name = "ZoneCode">
>     <xsd:complexType>
>      <xsd:simpleContent>
>       <xsd:extension base = "xsd:string">
>        <xsd:attributeGroup ref = "X_ZONECODE"/>
>       </xsd:extension>
>      </xsd:simpleContent>
>     </xsd:complexType>
>    </xsd:element>
>    <xsd:element name = "ZoneDescription">
>     <xsd:complexType>
>      <xsd:simpleContent>
>       <xsd:extension base = "xsd:string">
>        <xsd:attributeGroup ref = "X_NAME"/>
>       </xsd:extension>
>      </xsd:simpleContent>
>     </xsd:complexType>
>    </xsd:element>
>   </xsd:sequence>
>  </xsd:complexType>
> ---------------------------------------------------------------------------------------
> 
> Everything is fine but I have to specify attributes in XML instance file
> and my intention is to get them picled up from
> schema definition automatically.

I feel that this has been answered elsewhere, but just to repeat --
 1) You're using out-of-date syntax, see the latest PR version [1]
 2) You don't need to specify the attributes in the instance -- your
    definitions should supply them if/when they are absent.  Which
    processor is giving you trouble?

ht

[1] http://www.w3.org/TR/xmlschema-1/
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/
Received on Thursday, 12 April 2001 13:40:31 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Tuesday, 11 January 2011 00:14:20 GMT