The ClinicalDocument/id element is an instance identifier data type. The root attribute is an OID. If there
is a value in @extension, then the root uniquely identifies the scope of the extension.
If there is no value in @extension then @root SHALL uniquely identify the document
UUIDs SHALL be represented in the form XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX, where
each X is a character from the set [A-Fa-f0-9].
OIDs SHALL be represented in dotted decimal notation, where each decimal number is
either 0, or starts with a nonzero digit. More formally, an OID SHALL be in the form
([0-2])(.([1-9][0-9]*|0))+.
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