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DG connects the word "the" with proper nouns. In general, proper nouns 
may not take determiners; but we do allow proper nouns to take
the determiner "the". This allows things like "The Emir of
Kuwait died", "The Supreme Soviet met today", but not "*I have
known many Kuwaits", "*We need a Soviet". Other uses of
determiners with proper nouns are allowed with cost 2; see "D:
Determiners with Proper Nouns".

DG is used in the construction "The X-er, the Y-er." See "ER".
It is also used in certain idiomatic time expressions like "I
left the moment I saw him"; see "TT".

Grammar Documentation Page.