element attribute
{
 (
 attribute ns { text }?,
 attribute datatypeLibrary { xsd:anyURI }?,
 attribute * - (rng:* | local:*) { text }*
 ),
 (
 attribute name { xsd:QName }
 | (
 ( element * - rng:* { ... }* )
 & (
 element name { ... }
 | element anyName { ... }
 | element nsName { ... }
 | element choice { ... }
 )
 )
 ),
 (
 ( element * - rng:* { ... }* )
 & (
 element element { ... }
 | element attribute { ... }
 | element group { ... }
 | element interleave { ... }
 | element choice { ... }
 | element optional { ... }
 | element zeroOrMore { ... }
 | element oneOrMore { ... }
 | element list { ... }
 | element mixed { ... }
 | element ref { ... }
 | element parentRef { ... }
 | element empty { ... }
 | element text { ... }
 | element value { ... }
 | element data { ... }
 | element notAllowed { ... }
 | element externalRef { ... }
 | element grammar { ... }
 )?
 )
}