6 Markup Declarations: General (Clause 10)

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Except as indicated, LA does not discuss the following items, since it describes declarations but does not, for the most part, parse them. It has, accordingly, been listed for the most part as dna. NSGML applies only to document instances; for the most part, therefore, it has been listed here as dna. SGML Lite is designed to "enable a parser to extract all information contained in [the] document from the document instance alone, without reading the DTD or the document [type declaration] subset." It could be viewed as not restricting the form of markup declarations (sic) or as not applicable (dna); the latter is done here.

• 10.1.1 defines parameter separators and allows comments to occur within them (and thus in most but not all locations within declarations).
  
  [Sic Bas, LA, Min, SO, TEI; mod. PSGML; dna MGML, NSGML, SL. PSGML forbids comments within declarations other than comment declarations, in order to simplify the syntax. MGML declares elements using document-instance syntax rather than a special-purpose syntax; it thus has no distinction between parameter separators and other forms of white space; comment declarations, but not comments, may be embedded in its declarations.]

  	Disposition	Existing Proposals
  	Keep	Bas, LA, Min, SO, TEI
  	Revise	PSGML
  	Drop
  	Does not apply	MGML, NSGML, SL
  	Don't know

  
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• 10.1.3 defines name groups and name token groups (as distinct from model groups, defined in 11.2.4).

  	Disposition	Existing Proposals
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  	Revise
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  	Does not apply
  	Don't know

  
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• 10.1.4 defines ds (declaration separator) as containing
  • white space (s)
  • (parameter) entity ends
  • parameter entity references
  • comment declarations
  • processing instructions
  • marked section declarations
  
  
  [Sic Bas, Min, SO, TEI; mod. PSGML; dna LA, MGML, NSGML, SL. PSGML suppresses marked sections and processing instructions. LA does not parse marked sections and does not parse DTDs in any case. MGML does not use declaration separators.]

  	Disposition	Existing Proposals
  	Keep	Bas, Min, SO, TEI
  	Revise	PSGML
  	Drop
  	Does not apply	LA, MGML, NSGML, SL
  	Don't know

  
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• 10.1.5 defines associated element type (used in attlist declarations, short reference use declarations, and link rules) as either a single generic identifier or a name group. (The corresponding definition for element declarations is in clause 11.2.1.)
  
  [Sic Bas, Min, SO, TEI; mod. MGML, PSGML; dna LA, NSGML, SL. MGML associates an attlist declaration with an element type by means of an idref attribute; only single elements can be specified. PSGML allows (and TEI uses) only single names, not name groups, in both attribute definition list and element declarations.]

  	Disposition	Existing Proposals
  	Keep	Bas, Min, SO, TEI
  	Revise	MGML, PSGML
  	Drop
  	Does not apply	LA, NSGML, SL
  	Don't know

  
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• 10.1.6 defines external identifiers.
  
  [Sic Bas, MGML, Min, SO, TEI; mod. PSGML; dna LA, NSGML, SL. PSGML allows only system identifiers, not public identifiers.]

  	Disposition	Existing Proposals
  	Keep	Bas, MGML, Min, SO, TEI
  	Revise	PSGML
  	Drop
  	Does not apply	LA, NSGML, SL
  	Don't know

  
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• 10.1.7 defines minimum literals.
  
  [Sic Bas, Min, PSGML, SO, TEI; dna LA, NSGML, SL; sil. MGML.]

  	Disposition	Existing Proposals
  	Keep	Bas, Min, PSGML, SO, TEI
  	Revise
  	Drop
  	Does not apply	LA, NSGML, SL
  	Don't know	MGML

  
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• 10.2 defines formal public identifiers.
  
  [Sic Bas, Min, SO, TEI; om. PSGML; dna LA, NSGML;, SL sil. MGML.]

  	Disposition	Existing Proposals
  	Keep	Bas, Min, SO, TEI
  	Revise
  	Drop	PSGML
  	Does not apply	LA, SL
  	Don't know	MGML

  
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• 10.3 defines comment declarations.
  
  [Sic Bas, LA, MGML, Min, SL, SO, TEI; om. NSGML; mod. PSGML. PSGML allows only a single comment within a comment declaration, in the interests of simpler syntax.]

  	Disposition	Existing Proposals
  	Keep	Bas, LA, MGML, Min, SL, SO, TEI
  	Revise	PSGML
  	Drop	NSGML
  	Does not apply
  	Don't know

  
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• 10.4 defines marked section declarations.
  
  [Sic Bas, Min, SL, SO, TEI; om. LA, MGML, NSGML, PSGML.]

  	Disposition	Existing Proposals
  	Keep	Bas, Min, SL, SO, TEI
  	Revise
  	Drop	LA, MGML, NSGML, PSGML
  	Does not apply
  	Don't know

  
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• 10.4.1 (a) defines the status keywords legal in marked sections:
  • temp (not strictly a status keyword)
  • ignore
  • cdata
  • rcdata
  • include
  
  
  [Sic Bas, Min, SL, SO; mod. TEI; dna LA, NSGML, PSGML; sil. MGML. TEI initially allowed only include and ignore. The cdata keyword was added to the legal list later, because the TEI documentation uses it; the documentation also uses rcdata, but the TEI subset forbids it, probably in error.]

  	Disposition	Existing Proposals
  	Keep	Bas, Min, SL, SO
  	Revise	TEI
  	Drop
  	Does not apply	LA, NSGML, PSGML
  	Don't know	MGML

  
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• 10.4.1 (b) specifies that marked sections cannot nest within cdata or rcdata marked sections; they can nest within include and ignore marked sections. (A trap for the unwary parser writer.)
  
  [Sic Bas, Min, SL, SO, TEI; dna LA, NSGML, PSGML; sil. MGML.]

  	Disposition	Existing Proposals
  	Keep	Bas, Min, SL, SO, TEI
  	Revise
  	Drop
  	Does not apply	LA, NSGML, PSGML
  	Don't know	MGML

  
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• 10.5 defines the form of entity declarations.
  
  [Sic Bas, Min, SO, TEI; mod. MGML, PSGML; dna LA, NSGML, SL. MGML declares entities using instances of a specialized document type, rather than a specialized syntax. PSGML simplifies the syntax by allowing only a few forms.]

  	Disposition	Existing Proposals
  	Keep	Bas, Min, SO, TEI
  	Revise	MGML, PSGML
  	Drop
  	Does not apply	LA, NSGML, SL
  	Don't know

  
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• 10.5.1 (a) distinguishes general entity names from parameter entity names.
  
  [Sic Bas, Min, PSGML, SO, TEI; om. LA, MGML; dna NSGML, SL. LA explicitly prohibits parameter entity references, since it does not parse external DTDs and does not allow DTD subsets. MGML declares elements, attributes, and entities using document-instance syntax and thus has no use for parameter entities.]

  	Disposition	Existing Proposals
  	Keep	Bas, Min, PSGML, SO, TEI
  	Revise
  	Drop	MGML
  	Does not apply	NSGML, SL
  	Don't know

  
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• 10.5.1 (b) specifies that an entity may be declared more than once, and the first declaration encountered is binding.
  
  [Sic Bas, MGML, SO, Min, PSGML, TEI; dna LA, NSGML, SL.]

  	Disposition	Existing Proposals
  	Keep	Bas, MGML, Min, PSGML, SO, TEI
  	Revise
  	Drop
  	Does not apply	LA, NSGML, SL
  	Don't know

  
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• 10.5.3 defines three types of data text which can be used in declaring entities:
  • cdata
  • sdata
  • pi
  and requires that processing instructions which return data be defined as sdata entities, not pi entities.[9]
  
  [ Sic Bas, MGML, Min, SO, TEI; om. PSGML; mod. NSGML; dna LA, SL. NSGML allows sdata entities, but not cdata entities (and apparently also not pi entities).]

  	Disposition	Existing Proposals
  	Keep	Bas, MGML, Min, SO, TEI
  	Revise	NSGML
  	Drop	PSGML
  	Does not apply	LA, SL
  	Don't know

  
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• 10.5.4 defines four types of bracketed text:
  • starttag
  • endtag
  • ms (marked section; preceded by mss -- i.e. <![ -- and followed by msc -- i.e. ]]>)
  • md (markup declaration, preceded by mdo and followed by mdc)
  
  
  [Sic Bas, Min, SO, TEI; om. MGML, PSGML; dna LA, NSGML, SL.]

  	Disposition	Existing Proposals
  	Keep	Bas, Min, SO, TEI
  	Revise
  	Drop	MGML, PSGML
  	Does not apply	LA, NSGML, SL
  	Don't know

  
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