XML for Java Developers
G22.3033-002
Session 4 - Main Theme
XML Information Modeling (Part II)
Dr. Jean-Claude Franchitti
New York University
Computer Science Department
Courant Institute of Mathematical Sciences
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Agenda
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Summary of Previous Session
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Advanced Logical Structuring and XML Schemas
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XML-Based Software Development
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Business Engineering Methodology
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XML Metadata Management
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XML Linking/Pointer Language, XML Base, XML Inclusions
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XML Data Binding
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Industry Specific Markup Languages
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Parsing / Generating / Serializing XML Documents
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XML Metadata Management Tools
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Assignment 2b (due next week)
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Summary of Previous Session
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XML Physical Entities
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Logical Structure of XML Documents
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XML Document Navigation
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Java APIs
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Custom Markup Languages
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Readings
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Assignment #2a
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Advanced Logical Structuring
and XML Schemas
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See http://xml.coverpages.org/schemas.html
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XML Schema/Validation Proposals
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XML-Data (XDR)
Document Content Description (DCD)
Schema for Object-oriented XML (SOX)
Document Definition Markup Language (DDML)
Schematron
Datatypes for DTDs (DT4DTD)
Document Structure Description (DSD)
Regular Language Description for XML (RELAX)
TREX (Tree Regular Expressions for XML)
RELAX NG
Examplotron
Hook
Document Schema Definition Language (DSDL)
STEP/EXPRESS and XML
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XML-Based Software Development
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Business Engineering Methodology
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Language + Process + Tools
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e.g., Rational Unified Process (RUP)
XML Application Development Infrastructure
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Metadata Management (e.g., XMI)
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XML APIs (e.g., JAXP, JAXB)
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XML Tools (e.g., XML Editors, XML Parsers)
XML Applications:
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Application(s) of XML
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XML-based applications/services
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MOM & POP
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Other Services
Application Infrastructure Frameworks
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Business Engineering Methodology
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Business Model/Architecture
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Use Case View/Model
Application Model/Architecture
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Logical and Process View/Models
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Content, Data, and Process Model (e.g., OIM’s knowledge
management, and database/datawarehousing models)
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Application Infrastructure Model/Architecture
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Implementation View
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Component Model (e.g., OIM’s component and object model)
Technology Model/Architecture
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Deployment View/Model
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See Session 4 Sub-Topic 1, and Sub-Topic 2 presentations
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See Session 4 Handout on “Business and Application Architecture
Engineering”
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XML Metadata Management
Issue: UML may not provides enough modeling views and
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enough expressive power in each view to represent a complete
application
Possible Solutions:
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Extend UML:
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See OIM’s Analysis and Design Model
Use Different Modeling Languages:
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See Session 3 handout on “XML Information Modeling” (uses
different models such as UML, XML, and ORM)
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Use a Meta-Model: MOF and XMI
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See Session 3 handouts on “UML, MOF, and XMI” and “OMG’s
XML Metadata Interchange Format (XMI)”
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Design XML Schemas using UML:
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http://www-106.ibm.com/developerworks/library/x-umlschem/
XML Linking/Pointer Language
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XLink
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Allows elements to be inserted into XML documents in order to create
and describe links between resources
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See Article at http://www.simonstl.com/articles/xlink/
XML Base
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Equivalent of HTML BASE functionality generically in XML documents
by defining an XML attribute named xml:base
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XPointer
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http://www.w3.org/TR/xptr-element/, http://www.w3.org/TR/xptrframework/, http://www.w3.org/TR/xptr-xmlns/
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Language used as a fragment identifier for URI-references that locates a
resource of Internet media type text/xml or application/xml
Based on XPath
See Tools at http://www.xmlsoftware.com/xlink.html
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XLink Example
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<my:crossReference
xmlns:my="http://example.com/"
xmlns:xlink="http://www.w3.org/1999/xlink"
xlink:type="simple"
xlink:href="students.xml"
xlink:role="studentlist"
xlink:title="Student List"
xlink:show="new"
xlink:actuate="onRequest">
Current List of Students
</my:crossReference>
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XPointer Example
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<!DOCTYPE SPEECH [
<!ELEMENT SPEECH (#PCDATA|SPEAKER|DIRECTION)*>
<!ATTLIST SPEECH
ID ID #IMPLIED>
<!ELEMENT SPEAKER (#PCDATA)>
<!ELEMENT DIRECTION (#PCDATA)>]>
<SPEECH ID="a27"><SPEAKER>Polonius</SPEAKER>
<DIRECTION>crossing downstage</DIRECTION>Fare you well,
my lord. <DIRECTION>To Ros.</DIRECTION>
You go to seek Lord Hamlet? There he is.</SPEECH>
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id(a27).child(2,DIRECTION)
Selects the second "DIRECTION" element (whose content is "
To Ros.")
id(a27).child(2,#text)
Selects the second text region , "Fare you well, my lord." (The
line break between the SPEAKER and DIRECTION
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elements is the first text region.)
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XML Base Example
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<?xml version="1.0"?>
<html xmlns="http://www.w3.org/TR/xhtml1/strict"
xml:base="http://somewhere.org">
<head>
<title>Virtual Library</title>
</head>
<body>
<p>See <a href="new.xml">what's new</a>!</p>
<p>Check out the hot picks of the day!</p>
<ol xml:base="/hotpicks">
<li><a href="pick1.xml">Hot Pick #1</a></li>
<li><a href="pick2.xml">Hot Pick #2</a></li>
<li><a href="pick3.xml">Hot Pick #3</a></li>
</ol>
</body>
</html>
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"what's new" resolves to the URI "http://somewhere.org/new.xml" \
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"Hot Pick #1" resolves to the URI "http://somewhere.org/hotpicks/pick1.xml"
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"Hot Pick #2" resolves to the URI "http://somewhere.org/hotpicks/pick2.xml"
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"Hot Pick #3" resolves to the URI "http://somewhere.org/hotpicks/pick3.xml"
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XML Data Binding
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Aims to automatically generate substantial portions of the Java
platform code that processes XML data
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A Sun project, codenamed “Adelard”
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See JSR-31 XML Data Binding Specification, final release 3/4/03
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JAXB architecture: http://java.sun.com/xml/downloads/jaxb.html
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See: http://java.sun.com/xml/jaxp-1.0.1/docs/binding/DataBinding.html
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Industry Specific Markup Languages
(see http://www.oasis-open.org/cover/xml.html#contentsApps)
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Ontology Interchange Language (OIL)
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OMG Common Warehouse MetaData Interchange (CWMI)
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OMG Model Driven Architecture (MDA)
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Open Financial Exchange (OFX)
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Straight Through Processing Markup Language (STPML)
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Electronic Commerce Modeling Language (ECML)
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OASIS Business Transactions Technical Committee (OASISBT)
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BizTalk Framework (BizTalk)
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Commerce XML (cXML)
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RosettaNet (RosettaNet)
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Business Process Modeling Language (BPML)
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Readings
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Readings
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XML and Java: Chapters 2-3, 8, 15, App. A-C
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Processing XML with Java: Chapters 3-4, Appendix C
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Developing Java Web Services: Chapters 7, 8
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Handouts posted on the course web site
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Review XPath 1.0, XLink, XPointer, XML Base, XML Infoset,
XML Inclusion W3C Recs
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Project Frameworks Setup (ongoing)
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Apache’s Web Server, TomCat/JRun, and Cocoon
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Apache’s Xerces, Xalan, Saxon
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Antenna House XML Formatter, Apache’s FOP, X-smiles
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Visibroker 4.5 (or BES 5.2), WebLogic 6.1-8.1, WAS 5.0
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POSE & KVM (See Session 3 handout)
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Assignment
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Assignment #2a:
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This part of the project focuses on the application business
model discovery using XML information modeling technology.
The discovery process should adhere to the following steps: (a)
Documenting the information structure, (b) Representing the
information structure in XML form, (c) Defining XML DTDs
and/or Schemas
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More specific project related information, and extra credit
assignments will be provided during the session
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Assignment (continued)
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Assignment #2b:
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This part of the project relies on the business model discovery
process suggested in assignment #2a, and should demonstrate
the use of UML use cases to support the development of XML
DTDs and/or Schemas
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Deliverables:
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XML DTDs and/or Schemas (partial)
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XMI Model (partial)
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Use Objects by Design xmi-to-html.xsl style sheet and
Cocoon framework to present the resulting model
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Develop the model using Rational Rose (alternatives are
ArgoUML, Poseidon, Together/J, etc.), Java, and the XMI
toolkit (see IBM’s EMF, or other tools)
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Next Session:
XML Information Processing (Part I)
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Simple API for XML (SAX)
XML Parsers
JAXP APIs
XML Parsers and Coding Assist Tools
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