Invoke Service Query¶

Definition¶

<invoke_service_query type="wh_question" predicate="p"/>

<invoke_service_query type="yn_question">
  <proposition predicate="p">
</invoke_service_query>

Calls for an query to be sent to a service.

Attribute	Type	Description
type	string	Optional. Defaults to `wh_question`, but can be one of `wh_question`, `yn_question` or `kpq`.
predicate	string	Required if type="wh_question". This attribute specifies the predicate of the question sent to the service.
min_results	integer	Optional. Minimum number of expected results. Defaults to `1`.
max_results	integer	Optional. Maximum number of expected results. Defaults to `1`. Use values greater than 1 to accept multi-result queries.

Parents¶

Children¶

<proposition>
<embedded_question/> when type="kpq".

JSON format¶

{
  "invoke_service_query": {
    "question": { "wh": { "predicate": "available_animal" } },
    "min_results": 2,
    "max_results": 2
  }
}

Behaviour¶

An element calls for a query to be sent to a service, which (if successful) returns an answer.

The answer first becomes known to the system, and if the system knows the answer and the question is a goal question, this will trigger the system providing the answer to the user.

If max_results is greater than 1, the service may return multiple results. To store more than one fact for the same predicate, define the predicate with multiple_instances="true" in the ontology.

Examples¶

Invoke service query for getting the price of a trip.¶

<invoke_service_query type="wh_question" predicate="price"/>

Invoke service query allowing two or more results¶

<invoke_service_query type="wh_question" predicate="available_animal" min_results="2" max_results="2"/>

Invoke service query for checking if a person needs a visa.¶

<invoke_service_query type="yn_question">
  <proposition predicate="need_visa"/>
</invoke_service_query>