C/CIF - Chess Interchange Format
CIF - Player ID
<xs:complexType name="PlayerID">
<xs:simpleContent>
<xs:extension base="Identifier">
<xs:attribute name="organization" type="Organization" use="required"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:simpleType name="Organization">
<xs:union memberTypes="Identifier OrganizationID"/>
</xs:simpleType>
The organization, who is the provider of the player ID, may be given as a string, not starting with a colon, but in general it is recommended to use one of the predefined organization identifiers.
Note that the FIDE player ID is one of the most stable IDs – but unluckely even FIDE is reusing deleted identifiers, this means that also the FIDE player ID is not unique – some other player IDs like the ones given by the organization :DSB, or :ECF, are often changing.
<xs:simpleType name="OrganizationID">
<xs:restriction base="xs:string">
<xs:enumeration value=":ACF"/> <!-- Australian Chess Federation -->
<xs:enumeration value=":BdF"/> <!-- Bund deutscher Fernschachfreunde -->
<xs:enumeration value=":CCRL"/> <!-- Computer Chess Rating Lists
(http://www.computerchess.org.uk) -->
<xs:enumeration value=":ChessBase"/> <!-- ChessBase (www.chessbase.com) -->
<xs:enumeration value=":CFC"/> <!-- Chess Federation of Canada -->
<xs:enumeration value=":DSB"/> <!-- Deutscher Schachbund (German Chess Federation) -->
<xs:enumeration value=":ECF"/> <!-- English Chess Federation (fomerly BCF) -->
<xs:enumeration value=":EHCR"/> <!-- Edo Historical Chess Rating
(http://www.edochess.ca) -->
<xs:enumeration value=":FICGS"/> <!-- Free Internet Correspondence Games Server
(http://www.ficgs.com/) -->
<xs:enumeration value=":FICS"/> <!-- Free Internet Chess Server
(http://www.freechess.org) -->
<xs:enumeration value=":FIDE"/> <!-- World Chess Federation -->
<xs:enumeration value=":ICC"/> <!-- Internet Chess Club -->
<xs:enumeration value=":ICCF"/> <!-- International Correspondence Chess Federation -->
<xs:enumeration value=":Lichess"/> <!-- Internet chess server (lichess.org) -->
<xs:enumeration value=":NZCF"/> <!-- New Zealand Chess Federation -->
<xs:enumeration value=":Playchess"/> <!-- Internet chess server by ChessBase
(playchess.com) -->
<xs:enumeration value=":SchemingMind"/> <!-- International Correspondence Chess Club
(www.schemingmind.com) -->
<xs:enumeration value=":USCF"/> <!-- United States Chess Federation -->
<xs:enumeration value=":WNCA"/> <!-- World New Chess Association -->
</xs:restriction>
</xs:simpleType>
