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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 Editor, 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.