To answer questions like the one in the subject, check the XML
Recommendation, available at
http://www.w3.org/TR/REC-xml
The EBNF descripton of a document says:
[1] document ::= prolog element Misc*
Prolog is defined as
[22] prolog ::= XMLDecl? Misc* (doctypedecl Misc*)?
And Misc is defined as
[27] Misc ::= Comment | PI | S
So: A prolog, which comes before the document element, _can_ contain one
or more misc's, each of which _can_ be a Processing Instruction (PI).
______________________________________
Joe Kesselman, IBM Next-Generation Web Technologies:
XML, XSL and more. "may'ron DaroQbe'chugh vaj bIrIQbej"
("Put down the squeezebox and nobody gets hurt.")
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