It's not "mostly used" but if you need an XML parser with good support for XML Schema, you could take a look at XML::Xerces which provides Perl bindings to the Apache Xerces XML implementation.

One downside of this is that the developer is unlikely to be maintaining it for support of newer versions of Xerces (currently XML::Xerces supports Xerces 2.6.0, and Xerces 2.7.0 is available, with 3.0.0 being planned.

The advantage is that Xerces is a very complete SAX2/DOM/XML Schema implementation with good support and wide usage.

Steve Collyer