OpenTravel Model-Driven Schema at IATA

The OpenTravel Interoperability Framework

19th Meeting of the IATA XML Working Group (XMLWG/19)

Montreal 17-20 September 2012

The Model-Driven Standard

Advantage

Open “Model” Standards for the Travel Industry

• About OpenTravel • Why Model Driven?

• MDA Overview & Building Blocks • Enterprise Versus OpenTravel Models • Open-Model “Open” Standards for the Travel Industry

• The OpenTravel Interoperability Framework • Introduction & Benefits • Framework Components “At a Glance” • Framework Components “Under the Hood”

• Information Model • Capability Model • Component Model

• Q & A

© 2012 OpenTravel Alliance | www.opentravel.org

Agenda


The OpenTravel Alliance provides a community where companies in the electronic distribution supply chain work

together to create an accepted structure for electronic messages, enabling suppliers and distributors to speak the same

interoperability language, trading partner to trading partner.

About

OpenTravel

OpenTravel has been a member funded not-for-profit organization.

OpenTravel has been producing open standards for the travel industry.


Since…

1999

Since…

2001

OpenTravel has been re-architecting its open standard to support modern messaging environments…


Since…

2011

…and implementing a model driven architecture to streamline internal standards development and support implementer enterprise software development.


Why

Model Driven? Model driven standards naturally support system evolution.


Model Driven Architecture (MDA) » Overview

MDA is a framework for software development

• Defined by the Object Management Group (OMG) • MDA places importance on models in the software development process • The software development process is driven by the activity of modeling

your software system

Key Benefits for Enterprise

Productivity

Portability

Interoperability

Key Benefits for OpenTravel

Productivity

Domain Modeling

Schema Quality

Model Driven Architecture


Model Driven Architecture (MDA) » Building Blocks

It’s mostly about the model…

…but transformations are important too!

Model

Description of a system. PIM (independent) PSM (specific)

Model Language

A model is written in a well-defined language.

UML OCL

(Object Constraint Language )

Meta Object Facility (MOF)

Source to target language. Transformation

Definition

PIM to Code PSM to Code

Specific source model.

Transformation

Tool



Model Driven Architecture (MDA) » Typical Enterprise Models

Typical Enterprise-Level Model Structure



Model Driven Architecture (MDA) » OpenTravel Models

OpenTravel Model Structure


Typical Enterprise Models


Model Driven Architecture (MDA) » Open Model Standards for the Travel Industry


The “Open Model Principle” OpenTravel’s core competency is an open standard common information exchange model

that supports travel industry business requirements and innovation.

• Paradigm shift to “neutral” industry standards for the travel industry

– Platform/ tooling neutral – Architectural style neutral

• Emphasis on common information exchange modeling

• Collection of UML models – Support business functionality

• Easy mapping to internal business processes – Support the pace of travel industry innovation

• Enhancements made at the model level • Model publishing not labor intensive

• Collection of UML models – Support business functionality – Industry adopted transformation included (XML) – Other open source transformations

• JAVA, JSON, .NET


OpenTravel

Interoperability Framework

A broad component model for the entire travel industry ecosystem.


OpenTravel Interoperability Framework

The OTIF Framework uses a model driven architecture (MDA)

to better serve OpenTravel members, schema implementers and the travel industry as a whole.

OpenTravel Interoperability Framework (OTIF) » Introduction

• Streamlines OpenTravel standards development

• Provides “open” common representational models of all data and business functionality contained in OpenTravel specifications



OpenTravel Interoperability Framework (OTIF) » Key Benefits

Key benefits for OpenTravel, OpenTravel member companies and specification implementers include:

• Reduced schema enhancement time • Schema enhancements at the model level produce final

publication

• Reduced implementation time & cost • UML-based models integrate with enterprise level

development platforms • Canonical information model for context and

correlations allows IT, business and trading partners to speak the same language

• Increased schema quality • Interoperable framework components ensure optimum

reuse and reduce redundancy

• Improved schema governance • Best practices and policies integrated at the tooling

level

• Reference XML transformation


Framework Components

At a Glance Continuous XML component model refinement.



Four key framework components interoperate for continuous XML component model refinement.

OTIF Key Framework Key Components

<<InformationModel>>

A SQL Server-based canonical refactoring of OpenTravel’s Common Information Exchange Model (CIEM).

OpenTravel Lexis Canonical Model

1067

211

NORMALIZED TERMS

CONTEXTUAL FACETS

Key Components » Canonical Model


Travel industry UML capability models. Provides implementers with UML support at the business and technical level for XML Object Suite component & service composition models that map to business processes.

273

UML MODELS

Key Components » UML and Data Models


Automated XML publication packages. XML compiler that builds and enforces versioning for model XML transformation with type and service libraries.

Key Components » OpenTravel Library Builder

1

2

3 46

77

BUSINESS OBJECTS

CORE OBJECTS

A compendium of (best practice-based) reference solutions that make working with OpenTravel schema products more productive.


XML Cookbooks

Schema Dictionaries

Data Model

UML Models

Travel Glossary

Implementation Matrix

OpenTravel Forum

Key Components » Solution Builder

Reference solutions for implementers.


Framework Components

Under the Hood Tooling, models and products.


Interoperability Framework Specification Model

Three views of the Framework: Models, Tooling & Integration, Products


Under the Hood…

Information Model A common representational model of all data and data relationships contained in OpenTravel specifications.


Key Components » Information Model » Canonical Modeler

• Provides a common business vocabulary used in XML components, best practices and terms glossary

• Leverages other industry standards (IATA, ISO, etc.)

• Provides correlations for concepts that span multiple travel industry sectors

• Produces logical entity-relationship model for implementer database mapping

Used internally by OpenTravel Licensed from igniteXML




EXAMPLE: This example shows how the concept of a “price” in the canonical model relates to schema capabilities: • Air fare and tax

• Rental Car rate, charge and fee

• Hotel rate, charge and rate plan

Key Components » Information Model » Canonical Modeler


Under the Hood…

Capability Model UML catalog of OpenTravel schema functionality.


• State of the art UML Modeler

– Integrated with Canonical Modeler and OpenTravel Model Builder

– Capability stereotype imported from Canonical Model

– Component model exported to Model Builder

• Models included with publication in two formats

– XMI – UML


Key Components » Capability Model » UML Modeler

Altova UModel used internally by OpenTravel Licensed from Altova

(http://www.altova.com/umodel.html)


• Supported UML element constructs

• Stereotype • Tagged Values • Model • Package • Class • Property • Enumeration

• Supported UML diagrams

• Class • Package • Profile • Sequence • Use Case

• Multiple views of capabilities

• Type Library • Catalog (concept-

based)


Key Components » Capability Model » UML Modeler


Stereotype (ota2:) profiles applied at model, package, class and property level…


Key Components » Capability Model » UML Modeler Custom Features

…enforce the OpenTravel common information exchange model during transformation.


Tagged values assigned at stereotype level for XML component and type library classification…


Key Components » Capability Model » Custom Features

…enforce transformation to OpenTravel XML Object Suite OTM model.


OpenTravel-built Eclipse class library to transform between model XMI output and custom Model Builder OTM format.


Key Components » Capability Model » Custom Features


Under the Hood…

XML Component Model Light-weight and extensible XML object and service model with a companion compiler.


A View from the Top

A hierarchy of xml objects comprise the XML Object Suite component library

OpenTravel XML Object Suite Component Library


Component Library: Simple/ Atomic Type

The most granular building block in the XML Object Suite.

ota2: Model Stereotype Icon


Component Library: Enumeration

An Enumeration complexType with a simpleType base list of enumerated literals.

ota2: Model Stereotype Icons


Component Library: Value With Attributes

Groups of attributes related to a single base value that may be a simpleType or complexType open

enumeration.



Component Library: Core Object

A complexType that serves as a container for application data that defines common representations

of real world objects.



Component Library: Business Object

A complexType that is a containers for application data (such as an itinerary or a traveler profile) that is

commonly query-able and exists as a standalone object.



Component Library: Service

A collection of 2.0 components that support interoperable machine-to-machine interaction over a network specified in

Web Services Description Language (WSDL) format.




Compiler that transforms the OpenTravel model into XML Object Suite type libraries (XSD) and service libraries (WSDL)

Component Model » OpenTravel Library Builder

Compiler fundamentals

• Interchange format for service information models

• Defines 2.0 XML Object Suite types and schemas

• Compiles into XML schema (xsd) and WSDL

Library Builder used internally by OpenTravel Licensed from third-party Customized for OpenTravel



Includes repository capability to collaborate, manage, and distribute OTM XML models.

Component Model » OpenTravel Library Builder

Repository Benefits

• Sharing models within or across organizations • Lifecycle and version control of published models • Configurable security and access controls for

managed namespaces within a repository • Browsing and free-text searches of repository content • May be integrated with WSO2 (open source)

Governance Repository


Tooling • Component development GUI

and an OTM model to XSD compiler (Eclipse Java)


Component Model » Library Builder » Tooling Overview

OTA2 is OpenTravel’s new XML guidelines and messages OTM is the model transformation for creating OTA2 XML schemas


• Model metadata – Version – Status

– Namespace – Library name

– Imports and includes – Application context


Component Model » Library Builder » OTM Model Basics

• Supported model component types

– Simple Types • Simple • Closed Enumeration

– Complex • Open Enumeration • Value With Attributes • Core Object • Business Object

– Service



Model OTM File XSD Schema

<?xml version="1.0" encoding="UTF-8"?> <xsd:schema attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace=http://opentravel.org/OTA2/profile/v01 version="1.0.0" xmlns:ota=http://www.opentravel.org/ns/OTA2/common_v01_00 xmlns:otm=http://www.opentravel.org/ns/OTA2/AppInfo_v01_00 xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:annotation> <xsd:appinfo> <otm:Library> <otm:LibraryName>OTA2_Profile </otm:LibraryName> <otm:LibraryVersion>1.0.0 </otm:LibraryVersion> <otm:SourceFile>/Profile.otm </otm:SourceFile> <otm:CompilerVersion>2.2 </otm:CompilerVersion> <otm:CompileDate>2012-09-09T12:23:50.339-05:00</otm:CompileDate> </otm:Library> . . .

<?xml version="1.0" encoding="UTF-8"?> <Library xmlns=http://www.opentravel.org/ns/OTA2/LibraryModel_v01_01 xmlns:xsd=http://www.w3.org/2001/XMLSchema xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance xsi:schemaLocation="http://www.opentravel.org/ns/OTA2/LibraryModel_v01_01 OTA2_LibraryModel_v1.4.4.xsd"> <VersionScheme>OTA2</VersionScheme> <Status>Draft</Status> <Namespace>http://opentravel.org/profile/v01_01</Namespace> <Prefix>OTA2</Prefix> <Name>OTA2_Profile_v1.0.0</Name> <Import prefix="xsd" namespace="http://www.w3.org/2001/XMLSchema"/> <Context applicationContext="http://www.opentravel.org/OTM2" context="OTM2"/> . . .

Component Model » Library Builder » OTM Library Document

UML models just got cool.


Questions? Bonnie Lowell Specification Architect OpenTravel Alliance [email protected]

Technology

OpenTravel Model-Driven Schema at IATA