<?xml everywhere?>
DESCRIPTION
. ''XML could turn the Web into one giant database for translating information wending through disparate computer systems. XML could be the new Rosettastone.'' Anthony J. Blake, vice-president AT&T Labs in Menlo Park, Calif. David L. Mainz. AGENDA. XML Explosion - PowerPoint PPT PresentationTRANSCRIPT
<?xml everywhere?>
''XML could turn the Web into one giant database for translating information wending through disparate computer systems. XML could be the new Rosettastone.''
Anthony J. Blake, vice-presidentAT&T Labs in Menlo Park, Calif
David L. MainzDavid L. Mainz
AGENDAAGENDA
Session One (90 minutes)
Session Two (40 minutes)
Break (30 minutes)
XML Explosion
All about XML
Question & Answer (20 minutes)
XML in the trenches
XML in your business
PurposeAssumptions Heard the hype; read the trade journals Executive or Manager Perspective Wondering how XML can benefit your company
Goals A concise intro to XML for perspective Give a general idea where and how XML is
used and some examples of implementations Give understanding of benefits and risks of XML
XML Explosion Proliferation of XML-based Technologies XML Routers and Accelerators XML Databases and RDB Support Application Platforms: .NET, J2EE Web Services XML-based Languages: ebXML, VoiceXM XML Tools: Parsers, DOMs, Editors W3C Central Focus XML Books, Websites, Online Communities Companies delivering XML products, services IDC (research firm): By 2006, XML servers grow to
over $3 bln market, tools to $400 MM
What is <?XML?>eXtensible Markup LanguageMarkup Language-method of
conveying metadata—information about a dataset
Extensible—provides a standard mechanism for extending itself – create your own tags, structures
Text document that is self-describing, self-delimiting data using a set of HTML-like tags
XML Document<?xml version="1.0"?><!– comments here <?xml-stylesheet type="text/xsl" href="style2.xsl"?><WDTWEATHER> <HEAD> <DATE>N/A</DATE> <PLACE> <CITY>Farmington</CITY> <STATE>Michigan</STATE> </PLACE> </HEAD> <CURRENT> <TEMP units="F">67F</TEMP> <WEATHER>Sunny</WEATHER> <RH units="percent">50</RH> <WIND>10 MPH</WIND> </CURRENT> <PERIOD01> <![CDATA[ Whatever ]]><PERIOD01 /> </WDTWEATHER>
Prolog
Processing Instructions
Document Element
Properly Nested Child Elements
Element Attributes
CDATA Sections
Empty tag
Birth of a Meta-language
Based on Standard Generalized Markup Language SGML adopted in 1986 as data and exchange standard by the ISO SGML is powerful and extensible but considered too complex Started in 1996 by the W3C, XML was designed to have the
simplicity and mass appeal of HTML (also based on SGML) but with the power of extensibility
Current specification is XML 1.0 Recommendation (1998) with XML 1.1 advanced Candidate Recommendation earlier this month
W3C: XML is the universal format for structured documents and data on the Web
Goals of XML
XML shall be straightforward to use over the Internet
XML shall support a wide variety of applications
XML shall be compatible with SGML
It shall be easy to write programs which process XML documents
The number of optional features in XML is to be held to an absolute minimum, ideally zero
Goals of XML
XML documents should be human-legible and reasonably clear
The XML design should be prepared quickly
The design of XML shall be formal and concise
XML documents shall be easy to create
Terseness in XML markup is of minimal importance
XML Is a Family of Specifications Namespaces
Disambiguate vocabularies Application Program Interfaces
Document Object Model (DOM)Tree-based
Simple API for XML (SAX)Event-based
XML Schema or DTD Describes structure and constraints of
data Extensible Style Language (XSL)
Specifies transformation and presentation of content
XML Query Language (XQuery) Query and retrieving XML elements
XLink, XPointer, XPath Advanced linkage or navigation to
other nodes SOAP, UDDI
Remote procedure calls
DTD/Schema
Communicating your document structureDistinguishes Valid from Well-formedDocument Type DefinitionFormally and precisely delineates structure:
vocabulary, elements, attributes, relationshipsDTDs fall short in providing rigorous structure
declarations, such as data typing and namespace mixing, necessary for automated processing. Solution: Schema
Advantages of XML
Standards-based and OpenPortable and InteroperablePlatform, Application, Vendor NeutralIncreases Reliability as user agents automate processing
of documentsSaves training and development costs by having a singe
format with many usesRobust, Inexpensive, Optimized ToolsetReuse of data/multiple formatsHuman ReadableWeb Enabled
XML Concerns
Steep learning curve for tools and related technologies like XSL; not really simple
Developers must code own processing applications; learn new tools, languages
No standardization on schemas or tags—some industry fracture
Immaturity of products, standards, and securityXML is verbose: high storage, bandwidth, cpu
costAcronym proliferation: XML, XSL, XHTMLIs XML another IT fad???
XML SecurityXML not designed with security in mindNeed to secure documents (or portions) and
exchange thereofXML enc: encryption of data and tags or selected
parts of document using keysXML-Signatures: similar to security certificate to
ensure no tamperingXKMS: XML Key Management Spec –register
and distribute keys used by XML-SigXACML – eXtensible Access Control ML – used
to control access to documentsSAML – Security Assertion ML – authentication
process
General Application Classes
Extension (new language, vocabularies)Exchange (A2A, B2B, B2G)Transformation and Processing
Commerce & Industry
BPML: Business Process Markup Language Web Services: Fortune 1000 Aggressively
adopting web services– FactPoint Group and Outsource Research Consulting
Amazon.com web service allows searching on author, title, publisher, etc., and returns results in XML
Ebay Price Watcher web service Fedex Package Tracker Supply Chain: Major retail chains like Wal-
Mart are working on standards for synchronization between trading partners based on XML
HR XML
GovernmenteGovernment Initiatives
US OMB publishes Business Reference Model for its Federal Enterprise Architecture – XML document that describes federal business areas, functions, lines of business. Designed to facilitate efforts to transform govt to be more citizen-centered, results-oriented, market-based
IRS XML Developers Forum for Employment Tax E-File System- provides info to develop applications for E-file
Edgar Online promulgates eXtensible Business Reporting Language for companies to distribute financial reports in a portable way
Science & Education edXML – focuses on complex PK12 requirements– standards setting for best
practices MathML – describes mathematical notation structure and content Molecular Dynamics ML (MODL)- chemical simulations NeuroML – describes models and networks of neurons eXtensible Scientific Interchange Language – transport language for
scientific data objects Turing Machine Markup Language – describes Turing machines RiboML – used for ribosomal science
Semantic Web WWW designed for simplicity, not information
management Vision of the next generation network Content publishers provide notation to categorize
content Autonomous agents use that notation to gather,
filter, organize desired information Resource Description Framework (XML
language) Long way off; Fraught with many difficulties:
complexity, spam, proper categorization
XML in the Trenches
How are XML solutions implemented? Design or acquire XML document/schema/DTD XML Editors, Schema generator XML Parsers (SAX, Forward Only, In-Memory) XML DOM / DOM object XPATH XSL/T Biztalk, Web services
XML in Your Business
What are your questions? Should I be using XML? Where? What tools should I be using?
Where do I start? Why are you asking? Become an XML expert (or find one) Start small and proceed incrementally Understand your data Do you have data you exchange with outside partners, branches,
or departments Do you have partners already using XML Do you need to support multiple views or devices Can you find inefficiencies in your organization that could be
addressed by XML
Sources
Martin, Didier, et al., Professional XML. Wrox Press.
Richards, Russ. Information Briefing to the ANSI XML Forum, Oct. 11, 2001.
WWW Consortium (W3C)Doll, Shelley. XML Security Who’s Who.
Builder.com.
Links
www.w3c.org/xmlwww.xml.orgwww.xml.comwww.xmlmag.commsdn.microsoft.comwww.perfectxml.comwww.topxml.comxml.coverpages.org
Question & Answer (20 minutes)Question & Answer (20 minutes)
Break (15 Minutes)
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