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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Help: XML Schema - any element with fixed type?
 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@e...> >To: "Jeff Lowery" <jlowery@s...>; <xml-dev@l...> >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@e...] > > > > Sent: Thursday, June 01, 2000 9:19 AM > > > > To: xml-dev@l... > > > > 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 > > > > > > > > > > > > ------------------------------------------------------------------ > > > > The xml-dev list is sponsored by XML.org, an initiative of OASIS > > > > <http://www.oasis-open.org> > > > > > > > > The list archives are at http://lists.xml.org/archives/xml-dev/ > > > > > > > > To unsubscribe from this elist send a message with the single word > > > > "unsubscribe" in the body to: xml-dev-request@l... > > > > > > > > > >------------------------------------------------------------------ > > >The xml-dev list is sponsored by XML.org, an initiative of OASIS > > ><http://www.oasis-open.org> > > > > > >The list archives are at http://lists.xml.org/archives/xml-dev/ > > > > > >To unsubscribe from this elist send a message with the single word > > >"unsubscribe" in the body to: xml-dev-request@l... > > > > ----------------------------------------------------- > > > > > > ------------------------------------------------------------------ > > The xml-dev list is sponsored by XML.org, an initiative of OASIS > > <http://www.oasis-open.org> > > > > The list archives are at http://lists.xml.org/archives/xml-dev/ > > > > To unsubscribe from this elist send a message with the single word > > "unsubscribe" in the body to: xml-dev-request@l... ----------------------------------------------------- 
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