http://www.w3.org/2001/06/grammar
complexType metadata

{http://www.w3.org/2001/XMLSchema}anyType
    {http://www.w3.org/2001/06/grammar}metadata

Model

<...  (any attribute from any namespace)>
(any element from any namespace other than http://www.w3.org/2001/06/grammar)*
</...>

Prohibited substitutions (block)

allowed to substitute with an xsi:type attribute with any derived type

Content Type

element-only content, not nillable.
This type can be derived by extension or restriction.

Usage

grammar.class.metadata