Instantiate a schema validator.
Private _composerPrivate _validatorPrivate _addAdd a schema to the validator.
The plugin ID.
The schema being added.
A list of errors if the schema fails to validate or null if there
are no errors.
It is safe to call this function multiple times with the same plugin name.
Validate a plugin's schema and user data; populate the composite data.
The plugin being validated. Its composite data will be
populated by reference.
Whether plugin data should be populated, defaults to
true.
A list of errors if either the schema or data fail to validate or
null if there are no errors.
The default implementation of a schema validator.