An absolute interval is an interval where all the arguments
can be resolved into two positions into an Index, and none
of the specifiers can be adjusted.
Create a Timestamp given some seconds, some subSeconds, the length of the original
subSecond string, and whether to create an absolute or relative Timestamp.
An end-point interval is an interval where both of the the arguments
are end-points of the interval, and
can be resolved into two positions into an Index.
Construct an IndexReferenceDataHolder given
the IndexItem this is held in,
the ID of the Index to refer to and the Position of an IndexItem to refer to.
Construct an IndexReferenceDataHolder given the URI of the Index to refer to,
the ID of the Index to refer to, and the Position of an IndexItem to refer to.