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                                     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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