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Sentences uses an associative database comprising
two tables:
Items, each of which has a unique identifier,
a type and a name or a value.
Links, each of which has a unique identifier,
plus the identifiers of the source, association type ("verb")
and target of a fact that is recorded about the source.
Both the source and the target of a link may each
be an item or a link.
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An item can represent an entity ("BA009"), a value
("10:25"), an entity type ("Airport") or a value
type ("Time").
A link can represent an association ("BA009, departed
on, 10-Aug-2011") or an association type (Flight, departed
on, Date").
Both items and links also represent meta-types and instances, which
perform various functions in the database, such as recording schema
and transactions.
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