LIXE - Project Studying XML in Location-Based Services University of Jyväskylä, Faculty of Information Technology Prof. Jari Veijalainen Jouni Markkula Artem Katasnov Republica Corp. Eetu Ojanen Diego Ballvé

Architectures & Specifications Related to LBS Location Interoperability Forum (LIF) MLP - Mobile Location Protocol: – Open GIS Consortium (OGC) GML - Geographic MarkUp Language: – WMS - Web Map Service: – WFS - Web Feature Service: – Open Location Services initiative (OpenLS) – WAP Forum WAP Location Framework (adoption of LIF MLP) Recently Open Mobile Alliance (OMA)

General LBS Architecture XML encoded messages HTTP Post as binding mechanism LCS (Location Service): provides location of mobile users. LQB (Location Query Block): a wrapper of LCS into LIF Mobile Location Protocol (MLP). LCA (Location Attachment Block): if needed, attaches location information to a request. Portal service: the gateway to LBS. LBS: information service utilizing location data. Core spatial application and data services: building blocks for LBSs.

X-Fetch Wrapper Data conversion to XML according to rules specified with Data Extraction Language –Any input format –Any output XML format Data Extraction Language (DEL) is evaluated and published by the W3C –

X-Fetch Performer Reading and parsing XML streams (and files) –Low memory consumption –Synchronous reading and writing –SAX application program interface MAP file –Rules for data processing –Where to route the data –In which format to route the data J2EE compatible

LBS Architecture and X-FETCH + The blue blocks have to deal with: XML processing (requests, responses) Data streams (HTTP connection streams) Message generation based on templates.

X-FETCH LBS Demo

X-FETCH LBS Demo: process [1/2] Gateway: Generates XML formated request to Location Attachement Block. LAB Servlet: Performer processes HTTP request (XML) and generates a LIF MLP request for Location Query Block. LQB Servlet: Performer transforms LIF MLP request into LCS protocol’s request for Location Server. LQB Servlet: Wrapper reads LCS response and convert it into LIF MLP response. LAB Servlet: Wrapper takes in LIF MLP response and combines with the original user’s request, forwarding it to Portal.

X-FETCH LBS Demo: process [2/2] Portal Servlet: Performer processes HTTP request from LAB and generates WFS request for Web Feature Server. WFS Servlet: Performer processes WFS request into SQL (spatial) query for GML adapter. GML Adapter: uses SQL to query Oracle 9i Database and, combined with Oracle SDO API, generates GML response. WFS Servlet: Packs multiple queries results into a single WFS response (GML). Portal Servlet: Performer processes WFS response and returns to client whether XHTML or GML, according to the request.

Music Festival The environment is a Music Festival Limited, temporarily densely populated area Several stages Several eating and drinking places People active, mobile and social Assumptions –People have mobile terminals –Supporting positioning –Positioning accuracy ~10 m Stage 1 Stage 3 Stage 2 Parking Place Hamburgers Pizza & Beer

Planned LBS Concentration on “Pull” services (Mobile Originated Location Request) Stage Information –The real-time schedule of performers Text-based output Find Food & Drink –Finding eating & drinking places according preferences and present location Text-based and/or map based output Navigation support Find Friend –Finding identified friends Map-based output –Meeting request Text-based and/or map based output

Implemented LBS What’s Up page Stage Info page Restaurants (list) Restaurant Info (more info about given restaurant)