<!-- TriX: RDF Triples in XML -->
<!ELEMENT trix         (graph*)>
<!ATTLIST trix         xmlns CDATA #FIXED "http://www.w3.org/2004/03/trix/trix-1/">
<!ELEMENT graph        (uri, triple*)>
<!ELEMENT triple       ((id|uri|plainLiteral|typedLiteral), uri, (id|uri|plainLiteral|typedLiteral))>
<!ELEMENT id           (#PCDATA)>
<!ELEMENT uri          (#PCDATA)>
<!ELEMENT plainLiteral (#PCDATA)>
<!ATTLIST plainLiteral xml:lang CDATA #IMPLIED>
<!ELEMENT typedLiteral (#PCDATA)>
<!ATTLIST typedLiteral datatype CDATA #REQUIRED>