/usr/share/sgml/xhtml/sgml.soc is in w3c-sgml-lib 1.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 | -- SGML catalog for the W3C Markup Validation Service --
-- prefer public identifiers to system identifiers --
OVERRIDE YES
SGMLDECL sgml.dcl
-- ISO latin 1 entity set for HTML --
PUBLIC "ISO 8879-1986//ENTITIES Added Latin 1//EN//HTML"
"IETF/ISOlat1.ent"
PUBLIC "ISO 8879-1986//ENTITIES Added Latin 1//EN"
"IETF/ISOlat1.ent"
-- HTML 2 --
-- Ways to refer to Level 2: most general to most specific --
PUBLIC "HTML"
"IETF/HTML-2_0.dtd"
PUBLIC "-//IETF//DTD HTML//EN"
"IETF/HTML-2_0.dtd"
PUBLIC "-//IETF//DTD HTML//EN//2.0"
"IETF/HTML-2_0.dtd"
PUBLIC "-//IETF//DTD HTML 2.0//EN"
"IETF/HTML-2_0.dtd"
PUBLIC "-//IETF//DTD HTML Level 2//EN"
"IETF/HTML-2_0.dtd"
PUBLIC "-//IETF//DTD HTML Level 2//EN//2.0"
"IETF/HTML-2_0.dtd"
PUBLIC "-//IETF//DTD HTML 2.0 Level 2//EN"
"IETF/HTML-2_0.dtd"
-- Ways to refer to Level 1: most general to most specific --
PUBLIC "-//IETF//DTD HTML Level 1//EN"
"IETF/HTML-2_0-Level_1.dtd"
PUBLIC "-//IETF//DTD HTML 2.0 Level 1//EN"
"IETF/HTML-2_0-Level_1.dtd"
-- Ways to refer to Strict Level 2: most general to most specific --
PUBLIC "-//IETF//DTD HTML Strict//EN"
"IETF/HTML-2_0-Strict.dtd"
PUBLIC "-//IETF//DTD HTML 2.0 Strict//EN"
"IETF/HTML-2_0-Strict.dtd"
PUBLIC "-//IETF//DTD HTML Strict Level 2//EN"
"IETF/HTML-2_0-Strict.dtd"
PUBLIC "-//IETF//DTD HTML 2.0 Strict Level 2//EN"
"IETF/HTML-2_0-Strict.dtd"
-- Ways to refer to Strict Level 1: most general to most specific --
PUBLIC "-//IETF//DTD HTML Strict Level 1//EN"
"IETF/HTML-2_0-Strict-Level_1.dtd"
PUBLIC "-//IETF//DTD HTML 2.0 Strict Level 1//EN"
"IETF/HTML-2_0-Strict-Level_1.dtd"
-- HTML i18n --
PUBLIC "-//IETF//DTD HTML i18n//EN"
"IETF/HTML-i18n.dtd"
-- HTML 3.2 --
PUBLIC "-//W3C//DTD HTML 3.2//EN"
"REC-html32-19970114/HTML32.dtd"
PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"
"REC-html32-19970114/HTML32.dtd"
PUBLIC "-//W3C//DTD HTML 3.2 Draft//EN"
"REC-html32-19970114/HTML32.dtd"
-- HTML 4.0 --
PUBLIC "-//W3C//DTD HTML 4.0//EN"
"REC-html40-19980424/strict.dtd"
PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
"REC-html40-19980424/loose.dtd"
PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN"
"REC-html40-19980424/frameset.dtd"
-- HTML 4.01 --
PUBLIC "-//W3C//DTD HTML 4.01//EN"
"REC-html401-19991224/strict.dtd"
PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"REC-html401-19991224/loose.dtd"
PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN"
"REC-html401-19991224/frameset.dtd"
PUBLIC "-//W3C//ENTITIES Latin 1//EN//HTML"
"REC-html401-19991224/HTMLlat1.ent"
PUBLIC "-//W3C//ENTITIES Latin1//EN//HTML"
"REC-html401-19991224/HTMLlat1.ent"
PUBLIC "-//W3C//ENTITIES Special//EN//HTML"
"REC-html401-19991224/HTMLspecial.ent"
PUBLIC "-//W3C//ENTITIES Symbols//EN//HTML"
"REC-html401-19991224/HTMLsymbol.ent"
-- ISO-HTML --
PUBLIC "ISO/IEC 15445:2000//DTD HyperText Markup Language//EN"
"ISO-HTML/15445.dtd"
PUBLIC "ISO/IEC 15445:2000//DTD HTML//EN"
"ISO-HTML/15445.dtd"
PUBLIC "-//W3C//ENTITIES Full Latin 1//EN//HTML"
"REC-html401-19991224/HTMLlat1.ent"
PUBLIC "-//W3C//ENTITIES Symbolic//EN//HTML"
"REC-html401-19991224/HTMLsymbol.ent"
-- Do not prefer document type name over a SYSTEM Identifier. --
OVERRIDE NO
-- Fallback for HTML documents if no FPI is given. --
DOCTYPE html sgml.dtd
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