Validating XML Schema Documents
By default, XML Schema files are validated as you type. To change this, open the Preferences dialog box , go to , and deselect the Enable automatic validation option.
To validate an XML Schema document manually, select the 
Validate action from the
Validation toolbar drop-down menu or the XML menu. When
Oxygen XML Developer Eclipse plugin validates an XML Schema file, it expands all the included modules so
the entire schema hierarchy is validated. The validation problems are highlighted directly in
the editor, making it easy to locate and fix any issues.
Some validation messages have an icon (
) in the Info column in the Results view or at the
bottom of the main editor and clicking it opens a dialog box with additional information and a
link to the W3C specification exactly at the location where the error is described, thus
allowing you to understand the reason for that error.
@minOccurs or
@maxOccurs attribute having a value larger than 256 limits the value to 256
and issues a warning about this restriction in the Message panel at the bottom of the Oxygen XML Developer Eclipse plugin window. Otherwise, for large values of the @minOccurs and
@maxOccurs attributes, the validator fails with an OutOfMemory error
that might make Oxygen XML Developer Eclipse plugin unusable without restarting the entire
application.