verifying data in an XML document

[Joseph Nolting]

Hi,

I'm new to XML and I am working on a project where I need to verify
some of the data in the XML document. The tests I will need to verify
include: if a certain element exists then this element must exist, or
whether or not a certain attribute exists and has a value, or simply
if an element contains text content. My question is, what is the best
method to go about performing these verifications? Using a schema,
DTD, XSLT, or some other method?

Thank you,

Joseph Nolting

 

[Louis-Philippe Huberdeau]

DTD is the way to go, it's exactly what it does: validate the format.
XSLT will only transform the document to HTML, no validation will be made.