Web Services and AIXM

Introduction

Subramanyam “Subbu” Nadavala

Contractor, L-3 Communications

FAA Air Traffic Organization (ATO) Information Technology

Engineering & Configuration Management

Subramanyam.CTR.Nadavala@faa.gov

+1 405 464 3545

What is a Web Service?

• A Web Service is a URL-addressable software resource that performs functions (or a function)

• Web Services are platform independent

• Web Service interfaces are defined in Web Service Description Language (WSDL) and communicate using standard protocol known as SOAP (Simple Object Access Protocol)

• A Web Service performs a set of tasks, query/request information, update information and much more

– Example : Get list of FIXES in Texas

Web ServicesDevelopment Process

• Popular technologies used WSDL, XML, XSLT, SOAP, AXIS, J2EE and OC4J

• Define web service business requirements – service functionality– Web service provider– Web service consumer

Web Services Architecture

FIX Web service

Airport Web service

Oracle ESB

Ent

e rpr

i se

Se r

vice

Bu s

Web Feature Request

Web Feature Request

AIXM Response

AIXM Response

Service ProvidersService Consumers

SIAP

Web Feature Request

AIXM Response

Web Feature Request

Web Feature Request

AIXM Response

AIXM Response Obstacle Web serviceWeb Feature Request

AIXM Response

FIXWeb Feature Request

AIXM Response

Instrument Procedure Development System

Procedure Tracking System

Web Service Provider Tasks

• Design and develop WSDL and XML Schemas

• Publish WSDL and XML Schemas

• Develop web service provider functionality according to the WSDL

• Deploy web service provider code to the server

Provider Functionality FlowReceive Web Feature Request

Determine the request

Call database or external system to get the information

Valid Request

Sends SOAP Fault Response

Construct AIXM Object using XSLT

Sends AIXM Object Response

Invalid Request

Web Service Client Tasks

• Generate web service client programs using WSDL

• Access the web service

• Send request as WFS, receive response as AIXM Message

Request and Response Objects

• Web Feature Request Object

• AIXM Response Object

• Examples

Web Feature Request Payload<?xml version="1.0" encoding="UTF-8"?><req:GetFeatureRequest xmlns:aixm="http://www.aixm.aero/schema/5.0"

xmlns:gml="http://www.opengis.net/gml"xmlns:xlink="http://www.w3.org/1999/xlink"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:req="http://www.faa.gov/avnis/ipws/messages"xmlns:wfs="http://www.opengis.net/wfs"xmlns:ogc="http://www.opengis.net/ogc"xmlns:ows="http://www.opengis.net/ows"xsi:schemaLocation="http://www.faa.gov/avnis/ipws/messages ..\..\..\wsdl\faa\1.0.0\ipws-messages.xsd"Encoding="UTF-8">

<wfs:GetFeature outputFormat="text/xml; subtype=gml/3.1.1" resultType="results" traverseXlinkDepth="0"> <wfs:Query typeName="aixm:DesignatedPoint"> <ogc:Filter> <ogc:BBOX>

<!-- wfs:GetFeature: Retrieve all aixm:DesignatedPoint types that are within 25 Square miles of (39.8719444,-75.2411389). --><ogc:PropertyName /><gml:Envelope srsName="NAD83"><gml:lowerCorner>39.45527773333333 -75.65780556666667</gml:lowerCorner><gml:upperCorner>40.28861106666666 -74.82447223333332</gml:upperCorner></gml:Envelope></ogc:BBOX>

</ogc:Filter> </wfs:Query> </wfs:GetFeature></req:GetFeatureRequest>

AIXM Response Object<?xml version="1.0" encoding="UTF-8"?><fix:FixHoldingDataMessage xmlns:dpshare="http://www.faa.gov/avnis/dpshare" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:faa="http://faa.gov/infra/fix/ipws/logical/beans" xmlns:aixm="http://www.aixm.aero/schema/5.0" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:gml="http://www.opengis.net/gml/3.2" xmlns:fix="http://www.faa.gov/avnis/fixes" gml:id="FixHoldingDataMessage" xsi:schemaLocation="http://www.faa.gov/avnis/fixes

U:/AVNCommon/ITS_Projects/App_Support/WebService/AIXM/11062007 schemas/FPP-Fix_Holding_Data.xsd"> <fix:hasMember> <aixm:DesignatedPoint gml:id="DesignatedPoint-26973"> <gml:identifier codeSpace="http://www.faa.gov/AVNIS/Fix"/> <aixm:timeSlice> <aixm:DesignatedPointTimeSlice gml:id="DesignatedPoint-26973-0"> <gml:validTime> <gml:TimePeriod gml:id="DesignatedPoint-26973-0-TimePeriod"> <gml:beginPosition indeterminatePosition="unknown"/> <gml:endPosition>2006-08-03T00:00:00</gml:endPosition> </gml:TimePeriod> </gml:validTime> <aixm:interpretation>BASELINE</aixm:interpretation> <aixm:designator>JUNES</aixm:designator> <aixm:name>JUNES</aixm:name>

AIXM Response Object <aixm:isLocatedAt> <aixm:Point> <gml:pos srsName="NAD83">+39.92460555555555 -74.953325</gml:pos> </aixm:Point> </aixm:isLocatedAt> <aixm:extension> <fix:DesignatedPointExtension gml:id="DesignatedPoint-26973-0-Extension"> <fix:provides> <fix:DesignatedPointNASUse/> </fix:provides> <fix:extends> <dpshare:featureExtension> <dpshare:productionStatus>H</dpshare:productionStatus> <dpshare:revision>0</dpshare:revision> <dpshare:lastUpdateDate>2007-11-14T10:24:48</dpshare:lastUpdateDate> <dpshare:lastUpdatedBy>VARGASS</dpshare:lastUpdatedBy> <dpshare:stateTerritory>NJ</dpshare:stateTerritory> <dpshare:country>US</dpshare:country> </dpshare:featureExtension> </fix:extends> </fix:DesignatedPointExtension> </aixm:extension> </aixm:DesignatedPointTimeSlice> </aixm:timeSlice> </aixm:DesignatedPoint> </fix:hasMember></fix:FixHoldingDataMessage>

Web Services Security

• SOAP Headers with Tokens

• Transport level security, HTTPS

• Authentication, Authorization and Confidentiality

Web Services Demo

Questions ?

Contact Information

Subramanyam.CTR.Nadavala@faa.gov

+1 405 464 3545