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Relators are not normally used directly in DdexMessages: Relators are Dictionary linking entities (or 'ontological entities') which are used to create
all of the links which hold the Dictionary structure together. Example: a relationship
such as 'DealerPrice IsSubClassOf Price' results in a parent-child link being established
between 'Price' and 'DealerPrice'. Each Relator has a reverse or 'reciprocal' Relator which is used to describe the same relationship from the reverse point of view. Example:
'HasSubClass' is the reverse Relator of 'IsSubClassOf', and so a statement such as 'Price HasSubClass DealerPrice' has
the same meaning as 'DealerPrice IsSubClassOf Price'. This enables the Dictionary
to be navigated in all directions. Some Relators (e.g., 'IsSameAs') are used for describing a relationship in both directions and
so are their own reciprocals.
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