Martin Honnen wrote:

> 
> 
> danjourno wrote:
> 
>> I'm pretty much a beginner here when i comes to XML and developing web
>> services. And am just trying to get my head around it.  I have done a few
>> examples with the Java Application Server and it seems that everything
>> evolves around wsdl files.  This is fine.. But where do xsd files come 
>> into
>> it? The Web services that I'm hoping to ultimately build are to be 
>> written
>> to a whole bunch of standard xsd docs.  or something.??
> 
> 
> WSDL is an XML application which makes use of XML schema constructs/data 
> types to describe the parameters and result of a web service method.
> 

XSD are schema files, and are used to validate your xml document. That 
is, you specify a certain number of rules that state what should be 
considered as valid on your document. When you run your schema agaisnt 
an xml file, it would tell you if the document is valid, if it follows 
the rules. Otherwise, it would say that the document is not valid.
The advantage of schemas is just so that you know your documents are 
always correct according to the structure (or syntax in compiler 
parlance) that you specify.

Hope that helps

All the best