Validating XML against XSD

[Alexander Traxler]

 Posted by:  Alexander Traxler 

Hello Newsgroup!

Has anyone an example on how to validate a XML (already read into a
DOM-Class) against a XSD?
Preferred TD3.1, XML3.0

Can somone tell me how to do this?

Cheers,
Alex

[Jeff Luther]

 Posted by:  Jeff Luther 

Maybe someone will post an example of validating, Alex. But I had not
heard of this, so searched the 'net for XSD and came up with this link:
http://xmlfox.com/validate_xml.htm

It even shows link to a product/utility that will validate for you.

It still begs the question for me: What are the validation rules used
to compare an XML file with an XSD? Do you know that? I'm sure a link
in the search list might provide that, though didn't see it directly.

There are also what seem to be good links with the search: xsd validation
They might help you as well.

Best Regards,
Jeff @ PC Design
info. & samples: www.JeffLuther.net/gupta/

[Alexander Traxler]

 Posted by:  Alexander Traxler 

Hello Jeff!

Thanx for your suggestions!
I'll take a look at the link and keep on searching the net, too.

But it would still be great, if someone has an example in Gutpa-Code how to
validate against XSD.

Cheers,
Alex

[Alexander Traxler]

 Posted by:  Alexander Traxler 

Let me precise my situation:
I'm about to consume a webservice. My request includes data in XML for this
webservice as it is an order for pharmaceutics.
As response there is again XML to be analysed.
On my local machine there are XSD-files that contain the schemas for a valid
response.
Now I want to validate my XML in the response against these XSD-files, to
know the data is formatted correctly so I don't have to parse on my own
while processing the response.

The response then is already contained in a DOM-structure (as it comes in
the webservice-response).
The XSD is locally stored in a file.

Has someone such an example or can give me hints about that?
Even tips for tools would be appreciated!

Thanx in advance!

Cheers,
Alex

[StefanM]

 Posted by:  Stefan Misch 

Alexander,

I don't have an example at hand right now. I describe what you have to
do from my memory. I assume you use at least version 4.0 of the MSXML
Parser. I also assume you know how to build the APL with the ActiveX
wizzard.

(1) load the XMLSchema XSD file in a DOM document object
(2) create a schema cache (MSXML2_XMLSchemaCache?) object and add your
schema to the cache
(3) load your XML file into a DOM document
(4) set "validateOnParse"
(5) set the document schemas to the schema cache
(6) load the XML file

You may want to check for any parse errors.

HTH,
Stefan

[Alexander Traxler]

 Posted by:  Alexander Traxler 

Hello Stefan,

Thanx for the "walkthrough", this seems to do the validation.

Cheers,
Alex

[Alexander Traxler]

 Posted by:  Alexander Traxler 

Hi!

This is now my sample-function on how to do the XML validation.
TD 3.1, using the MSXML4.0 .

Cheers,
Alex