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Dynamic Feature Extensions to PIDF-LO

This draft proposes extensions to the Presence Information Data Format Location Object (PIDF-LO) to support dynamic features such as speed, bearing, acceleration, and elevation. It also addresses requirements and use cases for tracking the location of moving objects. The draft discusses protocol behavior, multiple moving object elements, and alternatives considered. Open issues and next steps are also outlined.

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Dynamic Feature Extensions to PIDF-LO

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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 personnel • Extends RFC 4119 with temporal feature elements

  3. Dynamic Feature Elements Based on GML’s dynamicFeature.xsd • Speed • Measure of the rate of motion • Bearing • Direction: compass point (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 in 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-status> 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. Could use <MovingObjectStatus> or its parent element <track> from GML’s dynamicFeature.xsd But… Backward compatibility problems OR <location> appears twice tuple 1 status geopriv 1 location-info movingobjectstatus location speed location-info geopriv 2 Alternatives Considered old system won’t find <location> duplicate <location> - mandatory below <movingobjectstatus> tuple 1 status geopriv 1 location-infolocation movingobjectstatus location speed geopriv 2

  8. Open Issues • How does watcher indicate support of dynamic feature in PIDF-LO? • Proposals: • list supported namespaces • Accept: application/pidf+xml; supported="urn:ietf:params:xml:ns:temporal1" • register a token for each (set of) namespaces • Accept: application/pidf+xml; supported="geopriv-temporal-features“ • watcher filter

  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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