/usr/share/dasher/colour.dtd is in dasher-data 4.11+git20130508.adc653-2.
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 | <!-- Colour schemes contain lists of colours to be used by Dasher -->
<!ELEMENT colours (palette*)>
<!ELEMENT palette (colour*)>
<!ATTLIST palette name CDATA #REQUIRED>
<!-- A list of rgb values -->
<!ELEMENT colour EMPTY>
<!ATTLIST colour r CDATA #REQUIRED>
<!ATTLIST colour g CDATA #REQUIRED>
<!ATTLIST colour b CDATA #REQUIRED>
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