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Use an URN for DTD ID

Nicolas Mailhot requested to merge nim/fontconfig:master into master

XML tools interpret “fonts.dtd” as a relative path.

Unfortunately, that can not work now that the configuration is spread over multiple system-dependant directories, without a common relative path to this file. And, an absolute path can not be defined in a system-independant way. System independance is a requirement to share config files between systems.

Therefore, replace the broken relative path by a formal URN, that will work the same way on all systems, without network access.

This makes the DTD registerable with commands like: $ xmlcatalog --noout --add system
"urn:fontconfig:fonts.dtd"
"file:///usr/share/xml/fontconfig/fonts.dtd"
/etc/xml/catalog

That enables easy config file checking: $ xmllint --loaddtd ${config_file} >/dev/null

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