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Vishal K. Singh Henning Schulzrinne Hannes Tschofenig IETF 67, San Diego

Dynamic Feature Extensions to the Presence Information Data Format Location Object (PIDF-LO) draft-singh-geopriv-pidf-lo-dynamic-00.txt. Vishal K. Singh Henning Schulzrinne Hannes Tschofenig IETF 67, San Diego. Requirements and Use Cases. Mechanism to indicate temporal features of entities

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Vishal K. Singh Henning Schulzrinne Hannes Tschofenig IETF 67, San Diego

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  1. Dynamic Feature Extensions to the Presence Information Data Format Location Object (PIDF-LO)draft-singh-geopriv-pidf-lo-dynamic-00.txt Vishal K. Singh Henning Schulzrinne Hannes Tschofenig IETF 67, San Diego

  2. Requirements and Use Cases • Mechanism to indicate temporal features of entities • Mechanism to track location of moving objects • Use cases: • Location tracking, Fleet management, Monitoring, Safety of personal • Extends RFC 4119, to carry temporal feature elements

  3. Dynamic Feature Elements Based on GML’s dynamicFeature.xsd • Speed • Measure of the rate of motion • Bearing • Direction e.g., A compass point is specified by a simple enumeration string type (e.g., "N", "NNE") • type gml:DirectionPropertyType • Acceleration • The rate (usually rapid) at which something happens • Elevation • The height of an entity above a reference level; altitude

  4. Example <presence xmlns="urn:ietf:params:xml:ns:pidf“ xmlns:gp=“urn:ietf:params:xml:ns:pidf:geopriv10” xmlns:temp="urn:ietf:params:xml:ns:temporal1“ entity="pres:geotarget@example.com"> <tuple id="sg89ae"> <status> <gp:geopriv> <gp:location-info> <gml:location> ………… </gml:location> <temp:speed uom="#kph">12</temp:speed> <temp:bearing> <temp:CompassPoint>SE</temp:CompassPoint> </temp:bearing> </gp:location-info> <gp:usage-rules> ………… ………… ………… </gp:usage-rules> </gp:geopriv> </status> <timestamp>2003-06-22T20:57:29Z</timestamp> </tuple> </presence>

  5. Protocol Behavior • Indicating the use of dynamic feature PIDF-LO • Indicating units of measure • GML units to measure parameters

  6. Multiple Moving Object Elements • Watchers may request to receive multiple location vector objects together • Use of <timed-presence> to transfer multiple location vector objects <tuple> <status> <gp:geopriv> .......... </gp:geopriv> </status> <timestamp>.....</timestamp> <timed-status from="some time" until="some time"> <gp:geopriv> ............ </gp:geopriv> <gp:geopriv> ........... </gp:geopriv> </timed-status> </tuple> <tuple> ....... </tuple>

  7. Alternatives Considered • Use of ‘MovingObjectStatus’ or its parent element ‘track’ from GML’s dynamicFeature.xsd • To prevent backward compatibility problem we don’t use MovingObjectStatus element • Else <location> element appears twice, once inside <MovingObjectStatus> and another as its sibling.

  8. Open Issues • How to indicate use of dynamic feature PIDF-LO • Proposal • Supporting namespace • Accept: application/pidf+xml; supported="urn:ietf:params:xml:ns:temporal1" • Alternative, registering a token • Accept: application/pidf+xml; supported="geopriv-temporal-features"

  9. Next Steps • Adopt this as WG draft • Submit a new version • Close the open issues • IANA considerations • Revise the text

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