| <!ELEMENT contexts (context)* > | |
| <!ELEMENT context (description, topic*) > | |
| <!ATTLIST context id ID #REQUIRED > | |
| <!ELEMENT description (#PCDATA|b)* > | |
| <!ELEMENT b (#PCDATA)* > | |
| <!ELEMENT topic EMPTY > | |
| <!ATTLIST topic label CDATA #REQUIRED > | |
| <!ATTLIST topic href CDATA #IMPLIED > |