Use of this type indicates a positive statement that the type has no children, and that its only purpose is to be present in a particular context. A sequence of integer values, delimited by slashes to suggest a nested node structure. General contact info for person(s) or organization(s). Very broadly structured. An extension of the date structure to support partial/incomplete dates. This is the supertype for the date match datatypes. An element declared of this type is then used as the header element for substitution groups that contain more restrictive content, because they are of type "YearMonthMatchType" or "FullDateMatchType". provides year information only as one boundary of an otherwise unbounded range (e.g. "before 1997".) If the match attribute's value is "onOrAfter" or "onOrBefore", the supplied year is taken to be included in the range. If "after" or "before", the year is excluded. provides a month of a particular year as one boundary of an otherwise unbounded range (e.g. "before March 1997".) If the match attribute's value is "onOrAfter" or "onOrBefore", the supplied month of the year is taken to be included in the range. If "after" or "before", that month is excluded. provides a specific date as one boundary of an otherwise unbounded range (e.g. "before March 12th, 1997".) If the match attribute's value is "onOrAfter" or "onOrBefore", the supplied date is taken to be included in the range. If "after" or "before", that month is excluded. provides year information only as the start of a date range. If the match attribute's value is "onOrAfter", the supplied year is taken to be included in the range. If "after", the year is excluded. provides year and month information as the start of a date range. If the match attribute's value is "onOrAfter", the supplied month of the supplied year is taken to be included in the range. If "after", that month and year is excluded. provides exact date information as the start of a date range. If the match attribute's value is "onOrAfter", the supplied date is taken to be included in the range. If "after", the date is excluded. provides year information only as the end of a date range. If the match attribute's value is "onOrBefore", the supplied year is taken to be included in the range. If "before", the year is excluded. provides year and month information as the end of a date range. If the match attribute's value is "onOrBefore", the supplied month in the supplied year is taken to be included in the range. If "before", that month of that year is excluded. provides a full date as the end of a date range. If the match attribute's value is "onOrBefore", the supplied date is taken to be included in the range. If "before", that date is excluded.