DTD question

[Ben Hui]

>
> DuCharme, Robert writes:
>
>  > > Is the following correct?
>  > > <!ELEMENT TYPE_OF_LOSS_CODE EMPTY>
>  > > <!ATTLIST TYPE_OF_LOSS_CODE >
>  >
>  > It is correct, but your second line is basically saying "here
> comes some
>  > attribute definitions for the TYPE_OF_LOSS_CODE element type,"
> and then it
>  > doesn't have any. This is legal (see production 52 of the XML
> spec), and
>  > would typically be used as a placeholder for where you're
> going to put the
>  > attribute definitions, but wouldn't serve much purpose that I
> know of in a
>  > production system.
>
> It's very useful in a system that's heavily configured with parameter
> entities (whether such a system itself is useful is an open debate).
>
>   <![%use-security-features;[
>     <!ENTITY % TYPE_OF_LOSS_CODE_atts "
>       security-level NMTOKEN #REQUIRED
>     ">
>   ]]>
>   <!ENTITY % TYPE_OF_LOSS_CODE_atts "">
>
>   <!ELEMENT TYPE_OF_LOSS_CODE EMPTY>
>   <!ATTLIST TYPE_OF_LOSS_CODE
>     %TYPE_OF_LOSS_CODE_atts;>
>

Can some kind people explain what the use of

>   <![%use-security-features;[
>     <!ENTITY % TYPE_OF_LOSS_CODE_atts "
>       security-level NMTOKEN #REQUIRED
>     ">
>   ]]>

I know XML use <![CDATA[....]]> for non-parse data, what are the other use
of <![..[..]]>
and what does this notation means in general?

ben


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