& XSLT Georg Rehm wrote:

>  Basically, one of the main differences between SGML DTDs and XML DTDs
>  is a feature called tag minimisation. This feature is not available in
>  XML and was introduced in SGML to keep file sizes small'ish. 
>  
>  In XML, an element declaration looks like
>  
>  	<!ELEMENT a        (b, c)>
>  
>  In SGML however, you have to specify whether tag minimisation may be used: 
>  
>  	<!ELEMENT a    - - (b, c)>
>  
>  The two hyphens specify that both the start and the end tag must be present.
>  Alternatively, you can use "O" (that's not "0", but "O" as in "_o_missible")
>  to specify that only the start tag, only the end tag or both may be left
>  out. 

Ahh, thanks. I wonder how one could ommit both tags and still be able to
distinguish this element from text nodes.

>  Tag minimisation is the reason why browsers do not insist that HTML 
>  elements such as <br>, <img> and <meta> have a corresponding end tag.

Unlike xhtml.

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