OMML: OPES Meta-data Markup Language
From: http://www.ietf-opes.org/documents/draft-maciocco-opes-omml-00.txt
See:  IETF Working Group for Open Pluggable Edge Services (OPES)
      http://xml.coverpages.org/opes.html

OMML - OPES Meta-data Markup Language Grammar  
    
The following XML DTD defines the OMML grammar.  
 
   <!ELEMENT proxylet           (owner, info)> 
   <!ELEMENT owner             (name, id, version)> 
   <!ELEMENT name               (#PCDATA)> 
   <!ELEMENT id                 (#PCDATA)> 
   <!ELEMENT version            (#PCDATA)> 
   <!ELEMENT info               (location,protocol+,exec-environment)> 
   <!ELEMENT location           (#PCDATA > 
   <!ELEMENT protocol           (modified-header*)> 
   <!ELEMENT modified-header    (#PCDATA)> 
   <!ELEMENT exec-environment   (#PCDATA)> 
   <!ATTLIST owner              description       CDATA> 
   <!ATTLIST info               date              CDATA> 
   <!ATTLIST info               contact           CDATA #REQUIRED> 
   <!ATTLIST protocol           name              CDATA #REQUIRED>