RE: Attribute use in XML schemas

Where in your link does it say that if an attribute is required then it cannot have a fixed value? 

 -----Original Message----- 
 From: Stefan Wachter [mailto:Stefan.Wachter@gmx.de] 
 Sent: Tue 8/27/2002 3:42 AM 
 To: Mesa Capela Encarnacion; xmlschema-dev@w3.org 
 Cc: 
 Subject: Re: Attribute use in XML schemas
 
 


 Attributes that are required are not allowed to have a fixed or default
 value. This was discussed  in this newsgroups some days ago. The relevant link
 is: http://www.w3.org/TR/xmlschema-1/#src-attribute.
 
 --Stefan
 
 >
 >
 >
 >
 > Hello!
 >
 > I am trying to define an XML document that conforms to a particular
 > schema, and I have the following problem: I define a first XML schema, and
 in
 > this schema I define a complex type with three attributes. I set the use
 of
 > these attributes to required, and I set one of this attributes to a fixed
 > value.
 >
 > Then I define a second XML schema, based on the first schema. In this
 > second schema, I define an element of the previous complex type, and set
 > another attribute to a fixed value.
 >
 > Finally I define an XML document based on the second schema. In this XML
 > document I see the element with the following values for the attributes:
 the
 > attribute I defined in the first schema appears in the XML document as
 > required, with the fixed value. Nevertheless, the attribute that I set to
 a
 > fixed value in the second schema appears in the XML document as optional,
 > instead of required, with the fixed value. Why this attribute is not
 included
 > as required in the XML document?. In the initial definition of the
 > attribute, the use was set to required, and I only add a fixed value for
 it, but I
 > didn't change the use of the attribute. Moreover, the use of the first
 > attribute is very similar, and this attribute is included as required,
 with the
 > fixed value, in the XML document.
 >
 > On the other hand, when I define a complex type in an XML schema, I define
 > an XML document based on this schema, with an element of the complex type,
 > and try to derive by restriction the complex type, I cannot modify the
 > facets of the attributes. Is it not possible to do this?. Why?.
 >
 > Thanks.
 >
 > Best wishes,
 >
 > Encarna
 >
 >

Received on Tuesday, 27 August 2002 10:28:46 UTC