2.1.1837 Part 4 Section 19.2.2.24, rel (Diagram Relationship)
a. The standard places no restrictions on the kind of shape that is defined by the idcntr attribute.
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Office requires that this shape be a connector.
b. The standard does not explicitly state that the shape identified by the idcntr attribute must exist.
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Office requires the shape identified by the idcntr attribute to exist.
c. The standard does not explicitly state that the shape identified by the idsrc attribute must exist.
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Office requires the shape identified by the idsrc attribute to exist.
d. The standard does not explicitly state that the shape identified by the iddest attribute must exist.
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Office requires the shape identified by the iddest attribute must exist.
e. The standard indicates that the idsrc, iddest and idcntr attributes are specified as a string.
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Office requires these attributes use a reference to an object ID in the form of an object name, as described in the ST_ObjIDRef (§3.9.4, ST_ObjIDRef) simple type.