Check feasibly valid - Checks whether Relax NG documents can be
transformed into valid documents by inserting any number of attributes and child elements
anywhere in the tree.
Note: Enabling this option disables the Check
ID/IDREF option.
Check ID/IDREF - Checks the ID/IDREF matches when a Relax NG
document is validated.
Add default attribute values - Default values are given to the
attributes of documents validated using Relax NG. These values are defined in the Relax NG
schema.