Re: Help: XML Schema - any element with fixed type?

[Risheng Lin <rlin@eng.utoledo.edu>]

Thank you!

Well, my schema does not have many elements like this, and I will try to 
fix it by telling the user what name(s) to use or using substitution 
group.  Seems XML schema does not support this, even for the top-level 
element if I know its type, but not the name.





At 09:01 PM 06/01/2001 +0100, Martin Gudgin wrote:
>I'm afraid what you are asking for is a kind of 'wildcard' that XML Schema
>does not support. What you are saying is; 'I know what the type of this
>thing will be, I just don't know what namespace name and local name it will
>have'. I had a similar requirement a little while ago for a schema I was
>writing. The closest you can get is, as Jeff points out, substitution groups
>but that only allows you to say; 'I don't know exactly what the name will be
>but I know it will be one of these...'
>
>The only thing I can suggest is to tell your users what element name(s) to
>use. They will have to use the correct element names for the content anyway
>( unless you were planning on using this technique for every element ) so
>why not the 'top-level' element too?
>
>Martin Gudgin
>DevelopMentor
>
>----- Original Message -----
>From: "Risheng Lin" <rlin@eng.utoledo.edu>
>To: "Jeff Lowery" <jlowery@scenicsoft.com>; <xml-dev@lists.xml.org>
>Sent: Thursday, June 01, 2000 8:58 PM
>Subject: RE: Help: XML Schema - any element with fixed type?
>
>
> > Thank you for your reply.
> >
> > But I don't think substitution group works for my question.
> >
> > To use substitution group, I must know the name of the element to
> > substitute in advance and specify them in the schema. The problem here is
> > that I don't know what the name of the tag the user want to use. I want to
> > let user freely choose the tag name, no matter it is <data1>, <data2>, or
> > <myappdata>, <data2001> etc. - as long as the content model of the element
> > ( here it is constrained by type in the schema ) is fixed. Of course, the
> > user can include or import the schema and then define the substitution
> > group for some element name, but it is much inconvenient to user.
>Moreover,
> > I prefer not to expose my schema definition to user, so that the user
> > doesn't need to learn schema so as to use the application.
> >
> > Is it possible?
> >
> >
> >
> >
> >
> > At 11:29 AM 06/01/2001 -0700, Jeff Lowery wrote:
> > >A substitution group will allow you to define a set of elements that are
> > >replacable for another element. The substitutable elements need to be of
>the
> > >same type, or a derived type, of the element they're being substituted
>for.
> > >
> > >If you want the type fixed, then you can use a 'final' type as the
>target(?)
> > >element type, then any substitute elements would have to be of that type,
> > >also.
> > >
> > > > -----Original Message-----
> > > > From: Risheng Lin [mailto:rlin@eng.utoledo.edu]
> > > > Sent: Thursday, June 01, 2000 9:19 AM
> > > > To: xml-dev@lists.xml.org
> > > > Subject: Help: XML Schema - any element with fixed type?
> > > >
> > > >
> > > > Hi,
> > > >
> > > > Can any one tell me whether there is a way to design an xml
> > > > schema such
> > > > that it allows a user to define any kind of element but with
> > > > fixed types?
> > > > i.e. the element tag name can be freely chosen by the user as
> > > > long as the
> > > > user's data follows the type defined in xml schema?
> > > >
> > > > For example:
> > > >
> > > > I want the following xml to be validated:
> > > >
> > > > <data1>
> > > >       <x />
> > > >       <y />
> > > > </data1>
> > > >
> > > >
> > > > <data2>
> > > >        <x/>
> > > >        <y/>
> > > >   <data2>
> > > >
> > > > Here <x/> <y/ > are the datatype defined in xml schema and it
> > > > needs to be
> > > > fixed - this can be easily defined in XML schema; but I want
> > > > the data tag (
> > > > here: data1 and data2 ) to be freely chosen by user and the
> > > > document is
> > > > still valid. How to design such schema?
> > > >
> > > > Note: it is different from <any>, and <anytype>.
> > > >
> > > > Any one can show my how to do it?
> > > >
> > > > Thanks in advance.
> > > >
> > > > Risheng
> > > >
> > > >
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