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<!entity % inline
        " (#pcdata | f| x| %emph; |sq| %xref | %index | file )* " >

Inlines may occure anywhere within the text, and doesn't have any influence to the textflow or logical structure of the document.

#pcdata: Parsed character data is just normal written text within the flow wich may contain other inlines.
f: Inline mathematical formulas according to the maths.dtd. See The Formula Tag.
x: The external tag wich is bypassing the parser. Tagged data walks directly into the mapped file. See chapter The External Tag for detailed information.
%emph;: Emphasizes of the text. See chapter Emphasizes.
sq: Shortquotes within the textflow. See chapter The Short Quote Tad.
%xref: XReferecnces within the text or external references. See chapter Labels and References.
%index: Again I can't explain this one. If you can, please mail.
file: Again I can't explain this one (I only could guess about picture files in eps). If you can, please mail.