Validating an XML Document Instance

Using the XML Editor, you can validate XML documents against an XML schema or verify that the document is well-formed. To validate against an XML schema, the document's root element must specify a schema location with the using the schemaLocation or the noNamespaceSchemaLocation attributes. For example, to specify the schema location in a document that does not use XML namespaces, specify the schema with the noNamespaceSchemaLocation attribute in the root instance like this:

<directory  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:noNamespaceSchemaLocation="Schema/directory.xsd" >
  ....
</directory>

If a document does not link to a schema, you can check that the document structure is well-formed but you cannot validate the structure against any schema.

Validate the document or check well-formedness as follows:

If the document is not open in the XML Editor, open it as described here. If the document is already open, save any changes.
Choose XML | Validate XML or XML | Check Well-formedness.
The XML Editor checks the structure of the document and displays an information dialog with the results. More detailed descriptions of validation errors are added to the Problems view.