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An XML Schema describes the structure of an XML document and is used to validate XML document instances against it, to check that the XML instances conform to the specified requirements. If an XML instance conforms to the schema then it is said to be valid. Otherwise, it is invalid.

Oxygen XML Editor offers support for editing Relax NG schema files in the following editing modes:
  • Text editing mode - Allows you to edit Relax NG schema files in a source editing mode, along with a schema design pane with two tabs that offer a Full Model View and Logical Model View.
  • Grid editing mode - Displays Relax NG schema files in a structured spreadsheet-like grid.
  • Author editing mode - The visual Author mode is also available for Relax NG schema files, presenting the schema similar to the Relax NG compact syntax. It links to imported schemas and external references. Embedded Schematron is also supported in Relax NG schemas with XML syntax.

For information about applying and detecting schemas, see Associating a Schema to XML Documents.