In most cases, one would expect to define an XML Schema and then generate XML that is compliant with that schema. However, I have been surprised at the number of times that I have needed to ...

What does XML schema actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.

We can define the vocabulary (what elements and attributes an XML document can use) using either a document type definition (DTD) or the XML Schema language.

Schemas are often designed with visual modeling tools that automatically create the SQL code necessary to define the table structures. See subschema and XML schema.