Walking through a schema XML Schemas are built using a set of predefined XML elements and attributes, which define the structure and content model of a document.

Though XML Schema powerfully expresses an XML document's structure, it has a steep initial learning curve. This article gets you up that hill fast. Author Graham King explains XML Namespaces and ...

What's more, instead of your Java program, a DTD (document type definition) or an XML Schema can maintain all your data validation rules.

It’s a XML editor built specifically for Mac OS X 10.6 and higher and provides a fully XML-aware editing environment with DTD and XML Schema-based auto-completion.