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ISO Entities

>/ "Kaiser Christian (SV SC RS T33)" <> was
heard to say:
>| how can implement symbols such as....
>|       "DOES NOT CONTAIN AS NORMAL SUBGROUP"  <!-- iso-amsn seems to be
>| responsible -->
>| I know the Identifier to use is .... 
>|       PUBLIC "ISO 8879:1986//ENTITIES Added Math Symbols: Negated
>| Relations//EN//XML"
>| What do I have to do with it?
>That depends on what your processing system is. Are you using SGML or
>XML? What tool are you rendering with? What do you want the implementation
>to do?
>                                        Be seeing you,
>                                          norm

I'm using XML DocBook 5.0 with Xalan (+ FOP) to create HTML (and PDF)
I'm sorry, I think chose the wrong word by using "implementation".
All I want to see as a result is a mathematical symbol within my output.

I've seen in your (really good) "DocBook Definition Guide" at ...

... a example: it puts the trade sign into document.
    Some kind of:
    ... <!ENTITY trade "&#x2122;"> ] <book> ... &trade; ...
... has to be within the DOCTYPE def. 

This example works fine, 
... but it does not with 

    <!ENTITY nsube "&#x2288;">

The nsube Symbol is defined at

So, what do I have to do to make my "Neither a subset of nor equal to" -sign

visible in the output?
I guess I have to use the ...
"ISO 8879:1986//ENTITIES Added Math Symbols: Negated Relations//EN//XML"
Identifier. But how?

Thank you very much for your help.

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