/usr/share/sgml/gconf/gconf-1.0.dtd is in gconf2-common 3.2.6-4.
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 | <!-- Top-level element -->
<!ELEMENT gconfschemafile (schemalist)>
<!-- A list of schemas -->
<!ELEMENT schemalist (schema)*>
<!-- A single schema. What I am trying to say is "this set of
elements, in any order". Duplicate elements (apart from <locale>) are
not allowed). -->
<!ELEMENT schema (key|applyto*|owner?|type|(list_type|(car_type,cdr_type))?|default?|locale*)*>
<!-- The key for this schema (e.g. /schemas/apps/foo/bar) -->
<!ELEMENT key (#PCDATA)>
<!-- The keys to apply this schema too (e.g. /apps/foo/bar) -->
<!ELEMENT applyto (#PCDATA)>
<!-- The name of the owner of these keys (e.g. foo) -->
<!ELEMENT owner (#PCDATA)>
<!-- The type of this schema (string|int|float|bool|list|pair)-->
<!ELEMENT type (#PCDATA)>
<!-- If <type> is a list, then this is the type of the members -->
<!ELEMENT list_type (#PCDATA)>
<!-- If <type> is a pair, then this is the type of the car (first element) -->
<!ELEMENT car_type (#PCDATA)>
<!-- If <type> is a pair, then this is the type of the cdr (second element) -->
<!ELEMENT cdr_type (#PCDATA)>
<!-- The default value for the key -->
<!ELEMENT default (#PCDATA)>
<!-- Localised default value, short description and long description -->
<!ELEMENT locale (default?,short?,long?)>
<!ATTLIST locale name CDATA #REQUIRED>
<!-- Short summary of the key -->
<!ELEMENT short (#PCDATA)>
<!-- Long description of the key -->
<!ELEMENT long (#PCDATA)>
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