Augmented Transition Networks
An augmented transition network, or
ATN, is an extended version of a transition network.
ATNs have the ability to apply tests
to arcs, for example, to ensure agreement with number. Thus, an ATN for
Sentence would be as shown in Figure 10.2, but the arc from node S2 to S3 would
be conditional on the number of the verb being the same as the number for the
noun.
Hence, if the noun phrase were three
dogs and the verb phrase were is blue, the ATN would not be able to follow the
arc from node S2 to S3 because the number of the noun phrase (plural) does not
match the number of the verb phrase (singular).
In languages such as French, checks
for gender would also be necessary. The conditions on the arcs are calculated
by procedures that are attached to the arcs. The procedure attached to an arc
is called when the network reaches that arc. These procedures, as well as
carrying out checks on agreement, are able to form a parse tree from the
sentence that is being analyzed.
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