BaseTypes.xsd allows empty values in element that have an not empty Invariant in RM

The BaseTypes.xsd allows empty values in elements such as OBJECT_ID.value, OBJECT_REF.namespace, DV_TEXT.value, CODE_PHRASE.code_string, which is not allowed by the RM invariants.

I have attached a modified R1.0.1 schema that rectifies this, which will need to be merged into the R1.0.2 schema.

NOTE: This attached schema also includes a modification related to ISO8601DateTime requiring a separator, which was incorrectly optional in this published schema, a separate issue will be raised for this.