Specifies the different ER types for a relationship qualification.
|int||DssXmlERType11||One - one relationship.|
|int||DssXmlERType1M||One - many relationship.|
|int||DssXmlERTypeM1||Many - one relationship.|
|int||DssXmlERTypeMM||Many - many relationship.|
|int||DssXmlERTypeParallel||New attribute is different to base attribute, but has same elements.|
|int||DssXmlERTypePerpendicular||New attribute is a different element of the same base attribute.|
One - one relationship.
One - many relationship. (One parent element may have several child elements).
Many - one relationship. (Many parent elements may have the same child elements).
Many - many relationship. (Arbitrary relationship.)
New attribute is different to base attribute, but has same elements.
New attribute is a different element of the same base attribute.