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EntityDef v/s PEDef

  • From: james anderson <mecom-gmbh@m...>
  • To: "xml-dev@i..." <xml-dev@i...>
  • Date: Wed, 17 Dec 1997 14:12:49 +0100

todays question from out of the blue:

do i follow PR-XML-19971208 correctly, that the only difference between
a general entity definition and a parameter entity definition
(syntactically modulo the '%') is that the general entity definition
permits a notation?
[70] EntityDecl ::=  GEDecl  | PEDecl
[71] GEDecl ::=  '<!ENTITY' S Name S EntityDef S? '>'
[72] PEDecl ::=  '<!ENTITY' S '%' S Name S PEDef S? '>'
[73] EntityDef ::=  EntityValue  | ExternalDef
[74] PEDef :=  EntityValue | ExternalID
[75] ExternalDef ::= ExternalID NDataDecl?
[76] ExternalID ::=  'SYSTEM' S SystemLiteral
                              | 'PUBLIC' S PubidLiteral S SystemLiteral
[77] NDataDecl ::=  S 'NDATA' S Name

(nb. spurious (?) '|' removed from [72])
what is the significance of ExternalDef? i found it referenced nowhere
else in the document.
[73'] EntityDef ::=  EntityValue  | ExternalID NDataDecl?
[74'] PEDef :=  EntityValue | ExternalID
[75x] <elimnated>
make the similarity clearer?

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