Pal gov.tutorial3.session15.uddi

‫أكاديمية الحكومة اإللكترونية الفلسطينية‬
The Palestinian eGovernment Academy
www.egovacademy.ps

Tutorial III:
Process Integration and Service Oriented Architectures

Session 15
UDDI

Prepared By

Mohammed Aldasht

PalGov © 2011 1

About

This tutorial is part of the PalGov project, funded by the TEMPUS IV program of the
Commission of the European Communities, grant agreement 511159-TEMPUS-1-
2010-1-PS-TEMPUS-JPHES. The project website: www.egovacademy.ps
Project Consortium:
Birzeit University, Palestine
University of Trento, Italy
(Coordinator )

Palestine Polytechnic University, Palestine Vrije Universiteit Brussel, Belgium

Palestine Technical University, Palestine
Université de Savoie, France

Ministry of Telecom and IT, Palestine
University of Namur, Belgium
Ministry of Interior, Palestine
TrueTrust, UK
Ministry of Local Government, Palestine

Coordinator:
Dr. Mustafa Jarrar
Birzeit University, P.O.Box 14- Birzeit, Palestine
Telfax:+972 2 2982935 mjarrar@birzeit.eduPalGov © 2011
2

© Copyright Notes
Everyone is encouraged to use this material, or part of it, but should properly
cite the project (logo and website), and the author of that part.

No part of this tutorial may be reproduced or modified in any form or by any
means, without prior written permission from the project, who have the full
copyrights on the material.

Attribution-NonCommercial-ShareAlike
CC-BY-NC-SA

This license lets others remix, tweak, and build upon your work non-
commercially, as long as they credit you and license their new creations
under the identical terms.

PalGov © 2011 3

Tutorial Map

Intended Learning Objectives
A: Knowledge and Understanding
Title T Name
3a1: Demonstrate knowledge of the fundamentals of middleware.
3a2: Describe the concept behind web service protocols.
Session0: Syllabus and overview 0 Aldasht
3a3: Explain the concept of service oriented architecture. Sesson1: Introduction to SOA 2 Aldasht
3a4: Explain the concept of enterprise service bus. Session2: XML namespaces & XML schema 2 Aldasht
3a5: Understanding WSDL service interfaces in UDDI. Session 3: Xpath & Xquery 4 Romi
B: Intellectual Skills Session4: REST web services 3 M. Melhem
3b1: Design, develop, and deploy applications based on Service Session5: Lab2: Practice on REST 3 M. Melhem
Oriented Architecture (SOA). Session 6: SOAP 2 Aldasht
3b2: use Business Process Execution Language (BPEL). Session 7: WSDL 3 Aldasht
3b3: using WSDL to describe web services.
Session8: Lab 3: WSDL practice 3 Aldasht
C: Professional and Practical Skills Session9: ESB 4 Aldasht
3c1: setup, Invoke, and deploy web services using integrated
Session10: Lab4: Practice on ESB 4 Aldasht
development environment.
Session11: integration patterns 4 M. Melhem
3c2: construct and use REST and SOAP messages for web
services communication. Session12: Lab5: integration patterns 4 M. Melhem
D: General and Transferable Skills Session13: BPEL 3 Aldasht
d1: Working with team. Session14: Lab6: Practice on BPEL 3 Aldasht
d2: Presenting and defending ideas. Session15: UDDI 2 Aldasht
d3: Use of creativity and innovation in problem solving.
d4: Develop communication skills and logical reasoning abilities.

Session 15: UDDI.
Session ILOs
After completing this module students will
be understood WSDL service interfaces in
UDDI

PalGov © 2011 5

Session Outlines

 Introduction
 UDDI registry structure
 Linking WSDL documents to a
UDDI registry
 Private versus public UDDI
registers

PalGov © 2011 6

Overview

• A service discovery platform UDDI, offers a global
repository containing [2]:
– Service endpoint implementation.
– Interface information
– Business-level information.
• A UDDI registry may refer to WSDL document
Web Services Application Code

UDDI API WSDL API SOAP API

UDDI WSDL SOAP

XML / XML namespace / XML Schema

Source, [2]

PalGov © 2011 7

Introduction

• Universal Description, Discovery and Integration (UDDI)
is a platform-independent, (XML)-based registry for
businesses worldwide to list themselves on the Internet [1].
• UDDI is an open industry initiative, sponsored by the
Organization for the Advancement of Structured Information
Standards (OASIS).
• UDDI originally proposed as a core Web service standard.
• UDDI provides a mechanism to register and locate web
service applications.

PalGov © 2011 8

Introduction, cont.

• UDDI is designed to be interrogated by SOAP
messages and to provide access to WSDL
documents.
• UDDI registry may offer [2]:
– Info about businesses and organizations offering
web services.
– Descriptions of web services that these
organizations provide.
– Info about technical interfaces to these web
services.

PalGov © 2011 9

Session Outlines

 Introduction
UDDI registry
registers

PalGov © 2011 10

UDDI registry structure

• UDDI service registry data model provides two types of
info:
– Business info about web services and provider.
– Technical info about web service binding.
• It is composed of 5 hierarchically organized data types:
– business entity: a top object contains info about web
service provider, like name.
– business service: a data structure to represent a
collection of correlated web services.
– binding template: exposes a service endpoint address
to access a distinct web service.
– tModel: exposes web service interface information.
– publisher assertion: supports publishing of business
relationships between business entities.

PalGov © 2011 11

Containment and reference relationship of
UDDI data structures
• In the UDDI data model hierarchy:
– One binding template may refer to several tModel
“Technical Model” entities.
– Different binding templates may refer to the same tModel
entities

Source, [2]
PalGov © 2011 12

Identification of Information Entities

• Individual UDDI information entities must be
uniquely identified through the value of a key
attribute.
• The table below lists the key attribute names for
the main UDDI information entities.
• UDDI defines a specific data type for these key
attributes.
– Called Universal Unique Identifier (UUID)

PalGov © 2011 13

Identification of Information Entities, cont.

• A UUID is basically a hex string [2],
– Automatically generated by the UDDI server when
an entity is saved for the first time.
– It is a dash-separated character sequence.
– e.g. “8-4-4-4-12”, the generation algorithm assures
uniqueness of these IDs
Information entity Key attribute name
businessEntity businessKey
businessService serviceKey
bindingTemplate bindingKey
tModel tModelKey

PalGov © 2011 14

The Identifier Bag

• In addition to the descriptive information about businesses
and their services, a formal identifiers are needed.
• A formal identification helps a consumer to find out who
is offering a service.
• Important for deciding whether to invoke a service or not.
• e.g. on identification systems:
– Data Universal Numbering System (D-U-N-S): uses 9-unique
digits
– Global Location Numbers (GLNs): uses 13-digit identification
sequences.

PalGov © 2011 15

Examples

e.g. on identifier bag, to be linked to namespace URI urn:uddi-org:api_v2:
<element name=“identifierBag” type=“uddi:identifierBag” />
<complexType name=“identifierBag”>
<sequence>
<element ref=“uddi:keyedReference” maxOccurs=“unbounded” />
</sequence>
</complexType>

A keyed reference data type represents the triplet:

<element name=“keyedReference” type=“uddi:keyedReference” />
<complexType name=“keyedReference”>
<attribute name=“tModelKey” type=“uddi:tModelKey” use=“optional” />
<attribute name=“keyName” type=“string” use=“optional” />
<attribute name=“keyValue” type=“string” use=“required” />
</complexType>

PalGov © 2011 16

Identifier bag of a business entity

• May contain several keyed references for a business
entity.
• Each reference identifies the business entity in a different
identifier system.
• tModels may have an identifier bag supplement.

Source, [2]
PalGov © 2011 17

Example on keyed reference
identification
• Identifying companyx business entity.
• The tModelKey value specifies the identifier system D-U-N-
S.
• keyName is human readable form of the identifier system
together with the identified company.
• keyValue holds the nine-digit D-U-N-S identifier of
companyx Inc.
– Assuming the company is listed in the identification system


<identifierBag>
<keyedReference
tModelKey=“uddi:8609C81E-EE1F-4D5A-B202-3EB13AD01823”
keyName=“D-U-N-S:companyx Inc.”
keyValue=“nn-nnn-nnnn” />
</identifierBag>
Source, [2]

PalGov © 2011 18

Category Bag

• Consumer must be able to select entities according categories.
– Helpful, when looking for unknown service.
• Distinct categories like:
– Region in which the service provider operates.
– The industry it belongs to.
– Products it offers to the market.
– Technical means required to invoke the service.
• Category bag contains: tModel, keyNames and
keyValues.
• Some categorization systems:
– Universal Standard Products and Service Classification system
(UNSPSC)
– North American Industry Classification System (NICS)
– International Standard for Geographical Regions (ISO 3166)

PalGov © 2011 19

UDDI Binding Template

A bindingTemplate
represents the
technical description
of a web service and
exposes its access
point information.
Source, [2]

PalGov © 2011 20

Linking WSDL documents to a UDDI registry

• A web service consumer navigating through the
UDDI business entities and services, must:
– Discover service network address, and
– Be delegated to an associated WSDL document describing
the technical conditions for calling the service.
• UDDI bindingTemplates and tModels may
implement this delegation mechanism.

PalGov © 2011 23

WSDL authoring for UDDI registers

• WSDL import element supports an arbitrary breakup of
individual WSDL information entities into separate files.
• The term WSDL interface and binding file is used to refer
to the file containing the portType and binding
elements.
• The term WSDL implementation file indicates the file
holding the service and port elements.
• WSDL implementation file imports the interface and
binding file
• The syntax of XML schema import element is
semantically equivalent to the WSDL import element.

PalGov © 2011 24

Private versus public UDDI registries

Private UDDI registries Public UDDI registries
• Have a limited reach, e.g. • Also known as public cloud.
within a company’s • Accessible from the Internet.
intranet or extranet. • Any other company can
• Cann’t publish or retrieve publish or get information
information from outside in/from the cloud
these UDDI registries. • Use a replicated UDDI
nodes.
• e.g. IBM, Microsoft, ...etc.
• http://www.uddi.org/register.html`

PalGov © 2011 26

Summary

During this session we have discussed how to
publish WSDL service interfaces in UDDI; So,
the following subjects have been covered:
1. UDDI registry structure
2. Linking WSDL documents to a UDDI registry
3. Private versus public UDDI registers

PalGov © 2011 27

References

1. Extracted from: http://en.wikipedia.org/wiki/UDDI, August 2011.
2. Olaf Zimmermann, Mark Tomlinson, Stefan Peuser, “Perspectives on
Web services-Applying SOAP, WSDL and UDDI to real-world projects,
2nd edition, Springer, 2005

PalGov © 2011 28

Pal gov.tutorial3.session15.uddi

Recommended

More Related Content

Viewers also liked (11)

Similar to Pal gov.tutorial3.session15.uddi (20)

More from Mustafa Jarrar (20)

Recently uploaded (20)

Pal gov.tutorial3.session15.uddi