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SGML Open Catalog: illustrating the use of public identifiers

Introduction: SGML Open Catalog library examples

Sample

  --
    Example catalog to illustrate use of public identifiers in SGML Open catalogs

   This catalog maps public identifiers to system identifiers on the
   assumption that all of the text objects are files within a common
   directory. The directory is declared in a BASE entry (the trailing
   slash is required), and the individual objects are given system
   identifiers that have no directory. Each public identifier is mapped to
   the concatenation of the base path and a system identifier that has no
   path.
  --

  -- Base directory, all relative system identifiers are relative to this.
     If the location of all text objects is changed to another common
     directory, only the BASE needs to be changed.
  --
  BASE    '../../../charset/entities/'

  -- Entity definitions, referenced by public identifiers according to
     current standard --
  PUBLIC  "ISO 8879:1986//ENTITIES Added Math Symbols: Arrow Relations//EN"   
      "iso-amsa.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Added Math Symbols: Binary Operators//EN"  
      "iso-amsb.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Added Math Symbols: Delimiters//EN"    
      "iso-amsc.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Added Math Symbols: Negated Relations//EN" 
      "iso-amsn.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Added Math Symbols: Ordinary//EN"  
      "iso-amso.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Added Math Symbols: Relations//EN" 
      "iso-amsr.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Box and Line Drawing//EN"  
      "iso-box.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Russian Cyrillic//EN"  
      "iso-cyr1.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Non-Russian Cyrillic//EN"  
      "iso-cyr2.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Diacritical Marks//EN" 
      "iso-dia.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Greek Letters//EN" 
      "iso-grk1.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Monotoniko Greek//EN"  
      "iso-grk2.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Greek Symbols//EN" 
      "iso-grk3.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Added Latin 1//EN" 
      "iso-lat1.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Added Latin 2//EN" 
      "iso-lat2.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Numeric and Special Graphic//EN"   
      "iso-num.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES Publishing//EN"    
      "iso-pub.ent"
  PUBLIC  "ISO 8879:1986//ENTITIES General Technical//EN" 
      "iso-tech.ent"

  -- Entity definitions, referenced by public identifiers according to
     an earlier standard --
  PUBLIC  "ISO 8879-1986//ENTITIES Added Math Symbols: Arrow Relations//EN"   
      "iso-amsa.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Added Math Symbols: Binary Operators//EN"  
      "iso-amsb.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Added Math Symbols: Delimiters//EN"    
      "iso-amsc.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Added Math Symbols: Negated Relations//EN" 
      "iso-amsn.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Added Math Symbols: Ordinary//EN"  
      "iso-amso.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Added Math Symbols: Relations//EN" 
      "iso-amsr.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Box and Line Drawing//EN"  
      "iso-box.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Russian Cyrillic//EN"  
      "iso-cyr1.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Non-Russian Cyrillic//EN"  
      "iso-cyr2.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Diacritical Marks//EN" 
      "iso-dia.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Greek Letters//EN" 
      "iso-grk1.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Monotoniko Greek//EN"  
      "iso-grk2.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Greek Symbols//EN" 
      "iso-grk3.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Added Latin 1//EN" 
      "iso-lat1.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Added Latin 2//EN" 
      "iso-lat2.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Numeric and Special Graphic//EN"   
      "iso-num.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES Publishing//EN"    
      "iso-pub.ent"
  PUBLIC  "ISO 8879-1986//ENTITIES General Technical//EN" 
      "iso-tech.ent"