[docbook-tc] Suns' task proposal

This is the model that Sun has come up for our task documentation.
Steve Cogorno Sun Microsystems
<!ELEMENT Task - -  (Title, IndexTerm*, TaskAbstract?, TaskPreReq?,
Procedure, Example*, RelatedInfo-Custom*, RelatedInfo*)> <!ATTLIST Task
%id.attrib;
%lang.attrib;
%remap.attrib;
%arch.attrib;
%os.attrib;
>  <!ELEMENT TaskAbstract - - ((Para Itemizedlist Note Tip Caution)+)> <!ATTLIST TaskAbstract
%remap.attrib;
>  <!ELEMENT TaskPreReq - - ((Para Itemizedlist Note Tip Caution)+)> <!ATTLIST TaskPreReq
%remap.attrib;
>  <!ELEMENT RelatedInfo-Custom - - (Title, (Para Itemizedlist Note Tip Caution)+)> <!ATTLIST RelatedInfo-Custom
%remap.attrib;
>  <!ELEMENT RelatedInfo - - ((Para Itemizedlist Note Tip Caution)+)> <!ATTLIST RelatedInfo
%remap.attrib;
role
( see-also
troubleshooting )
#REQUIRED
>