Re: [xml-dev] Ways to express "what I don't want"

Negation means that any time I say what I am, I can also say what I am not 
and therefore what is not allowed.  For example, eight-bit need not apply:
        <?xml encoding='us-ascii' ?>

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STSM, WebSphere Appliance Architect
https://www.ibm.com/developerworks/mydeveloperworks/blogs/soma/