/kb/sparql

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/kb/sparql Quick Facts

Category

Knowledge and reasoning

Message type

knowledge_core/Sparql

Perform a complex query on the knowledge base, using the SPARQL syntax.

See KnowledgeCore documentation for details.

Quick snippets

Call the service from command-line

$ rosservice call /kb/sparql knowledge_core/Sparql
# (tip: press Tab to complete the message prototype)

Call the service from a Python script

#!/usr/bin/env python

import rospy
from knowledge_core.srv import *


if __name__ == "__main__":

    rospy.wait_for_service("/kb/sparql")

    try:
        proxy = rospy.ServiceProxy("/kb/sparql", Sparql)
        response = proxy(args...) # check the knowledge_core/Sparql message type for the expected arguments
        rospy.loginfo(response)

    except rospy.ServiceException as e:
        rospy.logerror("Service call failed: %s" % e)