The Validation page of the Preferences window lists the validators available in your project and their settings.
The reason is that XML software should be small, fast, and compatible.
Be sure to let us know if you have any feature suggestions using the Feedback link on the left side.
Validates the XML string/file against the specified XSD string/file.
In addition, extended tools are available such as OASIS CAM standard specification that provide contextual validation of content and structure that is more flexible than basic schema validations.
xmllint is a command line XML tool that can perform XML validation.