Schema for the represenation of Calendar information. Copyright 2006 Alan L. Lovejoy. All rights reserved. Enumeration constants that serve as well-known keys to semantically identify a particular calendrical system. Although the keys are usually identical to the common name in English of each identified calendrical system, the keys should not directly be used as names. Instead, the keys should be mapped to the corresponding word in the language of the intended audience. Enumeration constants that serve as well-known keys to semantically identify the months of the Roman Calendars (the many variations of the Julian Calendar, and of course the international standard Gregorian Calendar.) Although the keys are identical to the common name in English of each identified month, the keys should not directly be used as names. Instead, the keys should be mapped to the corresponding word in the language of the intended audience. Enumeration constants that serve as well-known keys to semantically identify the months of the Hebrew Calendar. Although the keys are identical to the common name in English of each identified month, the keys should not directly be used as names. Instead, the keys should be mapped to the corresponding word in the language of the intended audience. Enumeration constants that serve as well-known keys to semantically identify the months of the Islamic ("Hijri") Calendar. Although the keys are identical to the common name in English of each identified month, the keys should not directly be used as names. Instead, the keys should be mapped to the corresponding word in the language of the intended audience. Enumeration constants that serve as well-known keys to semantically identify the months of the Persian Calendar. Although the keys are identical to the common name in English of each identified month, the keys should not directly be used as names. Instead, the keys should be mapped to the corresponding word in the language of the intended audience. Enumeration constants that serve as well-known keys to semantically identify the months of the Hindu and Indian-Civil Calendars. Although the keys are identical to the common name in English of each identified month, the keys should not directly be used as names. Instead, the keys should be mapped to the corresponding word in the language of the intended audience. Enumeration constants that serve as well-known keys to semantically identify the months of the Ethiopic Calendar. Although the keys are identical to the common name in English of each identified month, the keys should not directly be used as names. Instead, the keys should be mapped to the corresponding word in the language of the intended audience. Enumeration constants that serve as well-known keys to semantically identify the months of the Coptic Calendar. Although the keys are identical to the common name in English of each identified month, the keys should not directly be used as names. Instead, the keys should be mapped to the corresponding word in the language of the intended audience. Enumeration constants that serve as well-known keys to semantically identify the months of the Bahai Calendar. Although the keys are identical to the common name in English of each identified month, the keys should not directly be used as names. Instead, the keys should be mapped to the corresponding word in the language of the intended audience. Enumeration constants that serve as well-known keys to semantically identify the months of the some Calendar. Although the keys are identical to the common name in English of each identified month, the keys should not directly be used as names. Instead, the keys should be mapped to the corresponding word in the language of the intended audience. The effect of the "union" type declaration is to allow any month key for any calendrical system to be used. The XML parser will automatically bind a month key to the enumeration type to which it belongs. Enables a month to be referenced either by month ordinal or by a semantic key. If the month "ordinal" is equal to or less than zero, then it specifies the number of days before the last day of the month.