C/CIF - Chess Interchange Format
CIF - Namebase - Source
<xs:group name="Source">
<xs:choice>
<xs:element name="title" type="Token" minOccurs="0" maxOccurs="1"/>
<xs:element name="publisher" type="Token" minOccurs="0" maxOccurs="1"/>
<xs:element name="publication" type="Date" minOccurs="0" maxOccurs="1"/>
<xs:element name="version" type="xs:nonNegativeInteger" minOccurs="0" maxOccurs="1"/>
<xs:element name="date" type="Date" minOccurs="0" maxOccurs="1"/>
<xs:element name="quality" type="xs:positiveInteger" minOccurs="0" maxOccurs="1"/>
</xs:choice>
</xs:group>
<xs:complexType name="NSource">
<xs:sequence>
<xs:group base="Source"/>
</xs:sequence>
<xs:attribute name="id" type="NamebaseID" use="required"/>
</xs:complexType>
These attributes are especially defined for application ChessBase.
The quality will be given as an positive integer:
| 1 | Very high quality |
| 2 | High quality |
| 3 | Normal quality |
| 4 | Low quality |
| 5 | Very low quality |
