/usr/share/glib-2.0/schemas/gschema.dtd is in libglib2.0-dev 2.56.1-2ubuntu1.
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 | <!ELEMENT schemalist (schema|enum|flags)* >
<!ATTLIST schemalist gettext-domain CDATA #IMPLIED >
<!ELEMENT schema (key|child|override)* >
<!ATTLIST schema id CDATA #REQUIRED
path CDATA #IMPLIED
gettext-domain CDATA #IMPLIED
extends CDATA #IMPLIED
list-of CDATA #IMPLIED >
<!-- enumerated and flags types -->
<!-- each value element maps a nick to a numeric value -->
<!ELEMENT enum (value*) >
<!ATTLIST enum id CDATA #REQUIRED >
<!ELEMENT flags (value*) >
<!ATTLIST flags id CDATA #REQUIRED >
<!ELEMENT value EMPTY >
<!-- nick must be at least 2 characters long -->
<!-- value must be parsable as a 32-bit integer -->
<!ATTLIST value nick CDATA #REQUIRED
value CDATA #REQUIRED >
<!ELEMENT key (default|summary?|description?|range?|choices?|aliases?)* >
<!-- name can only contain lowercase letters, numbers and '-' -->
<!-- type must be a GVariant type string -->
<!-- enum must be the id of an enum type that has been defined earlier -->
<!-- flags must be the id of a flags type that has been defined earlier -->
<!-- exactly one of type, enum or flags must be given -->
<!ATTLIST key name CDATA #REQUIRED
type CDATA #IMPLIED
enum CDATA #IMPLIED
flags CDATA #IMPLIED >
<!-- the default value is specified a a serialized GVariant,
i.e. you have to include the quotes when specifying a string -->
<!ELEMENT default (#PCDATA) >
<!-- the presence of the l10n attribute marks a default value for
translation, its value is the gettext category to use -->
<!-- if context is present, it specifies msgctxt to use -->
<!ATTLIST default l10n (messages|time) #IMPLIED
context CDATA #IMPLIED >
<!ELEMENT summary (#PCDATA) >
<!ELEMENT description (#PCDATA) >
<!-- range is only allowed for keys with numeric type -->
<!ELEMENT range EMPTY >
<!-- min and max must be parseable as values of the key type and
min must be less than or equal to max -->
<!ATTLIST range min CDATA #REQUIRED
max CDATA #REQUIRED >
<!-- choices is only allowed for keys with string or string array type -->
<!ELEMENT choices (choice+) >
<!-- each choice element specifies one possible value -->
<!ELEMENT choice EMPTY >
<!ATTLIST choice value CDATA #REQUIRED >
<!-- aliases is only allowed for keys with enumerated type or with choices -->
<!ELEMENT aliases (alias+) >
<!-- each alias element specifies an alias for one of the possible values -->
<!ELEMENT alias EMPTY >
<!ATTLIST alias value CDATA #REQUIRED >
<!ELEMENT child EMPTY >
<!ATTLIST child name CDATA #REQUIRED
schema CDATA #REQUIRED >
<!ELEMENT override (#PCDATA) >
<!ATTLIST override name CDATA #REQUIRED
l10n CDATA #IMPLIED
context CDATA #IMPLIED >
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