Default XML Schemas
Default HTML Language Level
Normally, an HTML or an XHTML file has the <!DOCTYPE> declaration which states the language level of the used in the source code from the file. This language level is used as a standard against which the contents of the file are validated. If an HTML or an XHTML file does not have a <!DOCTYPE> declaration, the contents of the file will be validated against the default standard (schema). In the Default HTML Language Level area, choose the default schema to validate HTML and XHTML files without a <!DOCTYPE> declaration. The available options are:
HTML 4 or HTML 5: select one of these options to have files treated as HTML 4 or HTML 5 and validated against one of these standards.
Other doctype: select this option to have HTML files by default validated against a custom DTD or schema and specify the URL of the DTD or schema to be used.
Default XML Schema Version
In this area, choose the XSD (XML Schema Definition) Schema to validate XML files. The available options are:
XML Schema 1.1: see W3C XML Schema Definition Language (XSD) 1.1 Part 1: Structures and W3C XML Schema Definition Language (XSD) 1.1 Part 2: Datatypes for details.
XML Schema 1.0: see XML Schema Part 1: Structures Second Edition and XML Schema Part 2: Datatypes Second Edition for details.