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Other meta-information

<!-- comment -->
a comment, will be ignored by all processors
<?target data...?>
an instruction for a processor, target identifies the processor for which it is directed, data is a string containing the instruction
<!ENTITY name value>
declares an entity with a name and a value, expanded using entity reference: &name;
(external entities and parameter-entity references are ignored here...)
<!ELEMENT ...>, <!ATTLIST ...>, ...
DTD information (briefly mentioned later... - better alternatives: DSD, XML Schema)