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RE: Element as value of another Element

• From: "Michael Kay" <mike@s...>
• To: "'Shashank Gupta'" <gumnam_musafir@y...>
• Date: Tue, 15 Jan 2008 18:58:36 -0000

 
> 
> Thanks for your email. This is exactly what I want to do. 
> However, the below syntax does not work. I tried the 
> following but do not know how to assert 

1. Please don't go off-list. When people find the question in the archives
they expect to find the solution as well.

2. I mentioned that this was an XML Schema 1.1 solution. This is currently
available only as a working draft specification, and as far as I know the
only product that currently accepts <xs:assert> is my own Saxon-SA 9.0
processor, which you can get from http://www.saxonica.com/

Michael Kay
http://www.saxonica.com/


> 
> <xs:complexType name="some_name">
>     <xs:complexContent mixed="true">
>         <xs:restriction base="xs:anyType">
>             <xs:sequence>
>                 <xs:element name="b" type= "some_type" 
> minOccurs="0" maxOccurs="1"/>
>             </xs:sequence>
>         </xs:restriction>
>         <xs:assert select="exists(text()) ne exists(b)"/> 
>     </xs:complexContent>
> </xs:complexType>
> 
> Thanks
>  
> 
> ----- Original Message ----
> From: Michael Kay <mike@s...>
> To: G. Ken Holman <gkholman@C...>; 
> xml-dev@l...
> Sent: Tuesday, January 15, 2008 10:09:21 AM
> Subject: RE:  Element as value of another Element
> 
> If I understand correctly you want to allow things such as
> 
> 
> <a>asdfgh</a>
> 
> <a><b>oihvcg</b></a>
> 
> In XML Schema 1.1 you can do this by defining the content 
> model as mixed content, and then constraining it with an assertion:
> 
> <xs:complexType>
>   <xs:complexContent mixed="true">
>     <xs:sequence>
>       <xs:element name="b" minOccurs="0" maxOccurs="1"/>
>     </xs:sequence>
>   </xs:complexContent>
>   <xs:assert select="exists(text()) ne exists(b)"/> </xs:complexType>
> 
> Doing it with conditional type assignment would be nicer in 
> many ways: you really want to say that the type is either the 
> simpleType xs:string or a complexType that only allows a <b> 
> child - but conditional type assignment can only be driven 
> from attribute values, so that's not possible here.
> 
> Michael Kay
> http://www.saxonica.com/
> 
> 
> > -----Original Message-----
> > From: G. Ken Holman [mailto:gkholman@C...]
> > Sent: 15 January 2008 17:29
> > To: xml-dev@l...
> > Subject: Re:  Element as value of another Element
> > 
> > At 2008-01-15 07:50 -0800, Shashank Gupta wrote:
> > >I want to define an element of type string such that it's
> > value can be
> > >either of :
> > >-any string
> > >-value of another element of type string
> > >
> > >I am using Schema.
> > 
> > Using W3C Schema 1.0 you cannot express that as a constraint.
> > 
> > >Something like :
> > ><xs:simpleType name="a" value = any string OR another
> > element b of type
> > >string>
> > 
> > Using the ISO/IEC 19757-3 Schematron assertion-based constraint 
> > language you can express your desired constraint, but it is run 
> > separately from W3C Schema.
> > 
> > Off hand I'm not sure if the future W3C Schema 1.1 can help in this 
> > regard ... I suspect that it can since it supports co-occurrence 
> > constraints, but I don't know if there are limits.
> > 
> > I hope this helps.
> > 
> > . . . . . . . . . . . . . Ken
> > 
> > --
> > Comprehensive in-depth XSLT2/XSL-FO1.1 classes: Austin
> > TX,Jan-2008 World-wide corporate, govt. & user group XML, 
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> > G. Ken Holman                mailto:gkholman@C...
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> > 
> > 
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