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A Valid XML document is a Well-Formed XML document that also conforms to the rules of a schema that defines the legal elements of an XML document. The schema type can be: XML Schema, Relax NG (full or compact syntax), Schematron, Document Type Definition (DTD), or Namespace-based Validation Dispatching Language (NVDL).

The purpose of the schema is to define the legal building blocks of an XML document. It defines the document structure with a list of legal elements.

This section contains topics that explain the automatic and manual validation possibilities in Oxygen XML Author Eclipse plugin, how validation errors are presented, and information about built-in and custom validation scenarios.

For information about how to associate a schema for the purposes of validation (and content completion), see the Associating a Schema to XML Documents section.