Apple Newton Utilities Betriebsanweisung PDF herunterladen (Seite 656)

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CHAPTER 18

Intelligent Assistant

18-10 About the Assistant

The Signature and PreConditions Slots 18

Your task template must deﬁne two slots, called signature and

preConditions, which store arrays of templates and symbols, respectively.

The

signature slot holds action templates and target templates that must be

matched to complete the primary action. The

preConditions slot speciﬁes the

names of slots that the Assistant creates in the task frame as templates in the

signature slot are matched.

Each element of the

preConditions array is related to the corresponding

element of the signature array. Speciﬁcally, an element of the preConditions

array speciﬁes the name of the slot that the Assistant creates in the task frame when

the template in the corresponding element of the

signature array is matched.

For example, to send a fax the Assistant needs frames representing the action of

faxing, a fax number, the name of the person to whom the fax is sent, and the time

at which the fax is to be sent. The

signature slot in the following code fragment

speciﬁes by name the templates required to create these frames.

{...

// example: when fax_number is matched, Assistant creates

// a 'number slot in task frame & puts target frame in it

signature: [fax_action, fax_number, who_obj, when_obj],

preConditions: ['action, 'number, 'recipient, 'when],

...}

The corresponding elements of the preConditions slot specify the names of

slots that the Assistant creates in the task frame to hold the frames created as the

templates in the signature slot are matched. For example, the preConditions

array in the previous code fragment speciﬁes that the Assistant creates slots named

action, number, recipient and when in the task frame as necessary.

Continuing with the example based on the previous code fragment, when the

Assistant parses the input phrase

"fax Bob", it matches the word "fax" to the

fax_action template in the first element of the signature array and creates an

action frame from this template. The Assistant places this action frame in an

action slot (named for the symbol in the first element of the preConditions

array) that it creates in the task frame. Similarly, the Assistant creates a target

frame when the word

"Bob" is matched to the who_obj template in the third

element of the

signature array. The Assistant places this target frame in a

recipient slot (named for the symbol in the third element of the

preConditions array) that it creates in the task frame.

Words representing elements of the

signature array do not necessarily need to

appear in the input string in order to be matched to a template; for example, your

PostParse method might supply Bob’s fax number by finding it in the

Names soup.

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