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SP2001
Transparency No. 1
XML Technologies and Applications
Cheng-Chia Chen
Feb. 2002
XML Introduction
Transparency No. 2
contents
What is XML ?Where does XML come from? What is its status?Why do we need XML ?XML v.s Other formatsCore XML Specifications and APIsHow can we do with XML?XML sitesA partial list of XML applications and industry
initiativesa sketch of XML documents
XML Introduction
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What is XML ?
The eXtensible Markup Language a data-structure definition language : let you define the str
ucture and format of your own data. a data format (syntax) used for the representation, storag
e and transmission of data whose format it defined. Text-based markup Language, let you define your own HT
ML-like markup languages. Recommended by World Web Consortium (W3C) in Feb 1
998. intended to be used a new message format over the Intern
et to complement the inadequacy of HTML. a subset of SGML
is now very popular and becomes the dominating interchange format of information over the internet
XML Introduction
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A Glimpse of a simple XML document
HTML source code for a product catalog: <TABLE BORDER=1>
<TR>
<TH>Product ID</TH>
<TH>Description</TH>
<TH>Price</TH>
</TR>
<TR>
<TD>12345678-Q</TD>
<TD>Mitac 5339-1</TD>
<TD>NT$60,000</TD>
</TR>
</TABLE>
Product ID Description Price
12345678-Q Thinkpad 2000D $60,000
XML Introduction
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XML uses markup tags as well, but, describe the content, rather than the presentation of that content.
the same example coded in XML:
<product> <id> 12345678-Q </id> <description> Mitac 5339plus</description> <price> NT$60,000</price> </product>
Notes: 1. Only contents are encoded in the XML text. 2. All data are annotated by markups indicating their roles or fu
nctions in the message.
A glimpse of a simple XML document (cont’d)
XML Introduction
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Where does XML come from ?
a simplified subset of the Standard Generalized Markup Language (SGML) standardized in 1986, based on the Generalized Markup Language invented by IBM in 1969
simplified for more general use on the Web and as a data interchange format. without losing extensibility, easier for anyone to write valid XML. easier to write a parser easier for the parser to quickly verify that documents are
well-formed and/or valid.
Recommended by W3c at Feb. 1998.
XML Introduction
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What is the status of XML?
embraced by all of the leaders in the computer industry. many vertical industries are embracing XML for its ability
to expedite the availability of their domain-specific information for internal and external use.
IBM, Microsoft, Sun, Oracle, HP, …
There are many W3C-proposed extensions to XML. Most use the XML language, which minimizes the
differences in syntax that must be learned.
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Sun’s java API support for XML (skipped)
JAXP (java API for XML Parsing; 1.0; 1.1) enables Java applications to read, manipulate, and generate XML
documents. 1.1 supports (DOM) Level 2.
JAXM (Java API for XML messaging) enables packaging, routing, and transport of XML and other
messages using HTTP, SMTP, and FTP, useful to programmers building robust, secure e-commerce
applications.
JAXB (Java API for XML Data Binding ) intended to help develop and maintain XML-enabled applications with
a minimum of effort. JAXB maps XML documents to Java objects. include a compiler automatically generating Java classes from XML
schemas.
XML Introduction
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Why do we need XML ?
Old three-tier WWW architecture :Major information flows (for human information retri
eval):
(human) -->client browser --(http)--> webServer
--> CGI(query) --> databases -->wrap result into html or other MIME formats --(http) ---> browser ---(data rendering) --> human
major interactions and interchanged data formats: application type: information retrieval Man ---(html/MIME)--- machine(browser+web server) web server ----(machine dependent)--- backend system
(databases)
XML Introduction
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IE5,6
NETSCAPE
...
...
IISapache
client browser
web server
web server
web server
client browser
client browser
the internet
databasesfile
system databasesfile
system
databasesfile
system
queryresult tables
query(post,get)http
html/textgif/jpegvideo/audio
XML Introduction
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The other major WWW applications: business applications
XML Introduction
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Additional Interactions for WWW business applications
New application type : web serviceadditional interactions
backend business system <---> webserver <--> webserver <---> backend business system
Problem: Too many data format exist among the systems and web servers understanding all kinds of data formats are hard to implement.
Solution: define a universal or a small set of universal data formats and require all systems to transmit data using such formats.
but the existing HTML + MIME formats not enough ? NO!! HTML, while amendable to human via browsers, is n
ot easy for machine to understand/retrieve data.
XML Introduction
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Advantages of XML over HTML
XML can define your own tags.XML tags describe the content, rather than the pres
entation of that content easier for content search. easier for page development (separating content from vie
w) easy for devices to render the contents depending on its
environments (single model/multiple views)Notes for the next figure:
searches can be applied to XML data more easily, and the result can be rendered differently, depending on the destination device.
the XML processor can exist on the server, the client, or both.
XML Introduction
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work done by the XML processor in response to a client request:1. collect data from related data sources2. merge sources into a unifying content3. rendering data depending on the client’s environment.
XML Introduction
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Business area benefited from XML use
e-commerce there are now many specific XML languages to describe
orders, transactions, inventory, and billing. These open XML languages will allow manufacturers, reta
ilers, and consumers, even banking and accounting systems to share the same data.
Meaningful searches, platform independence If Web data (contents) is encoded in XML, customers can
find your product or service, and purchase it, without regard for the used (server/client) platforms.
Data accessibility XML schema allow XML documents to encod
e the datatype information and relationships in existing databases.
XML Introduction
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Business area benefited from XML use
XML extensions such as XQuery can be used to specify queries within XML.
Database information can be immediately accessible as XML on corporate intranets or the Web. XML views provided now by most venders
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Business area benefited from XML use
Application simplification Today's applications suffer from file-format bloat. XML's open and extensible nature allows us to represent
all of the functionality of different existing formats in one XML domain-specific grammar.
enable the sharing of data over the Internet.Since the actual data but not its presentation is encoded, it may
be presented on any output device from the PC with a browser to the cell-phone and small PDA.
XML Introduction
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Comparison of XML and Other formats
HTMLText-based non-markup formats
.c .cpp .java .ini …
Binary formats .dll .exe .o .swf .class .png .jpeg …
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Advantage of XML over text formats
Ex: JavaML v.s Java; CppML v.s Cpp XMI v.s rational’s proprietary format web.xml v.s ***.ini (for configuration)
advantage: structure explicitly represented in the XML format. (free and) standard tools (and API) exists for quick parsing of the XM
L format. => front-end processing avoided/reduced
disadvantage: too verbose. for storage and transmission.
can be overcome by compression
for human generation; (not a problem for machine generation) require smarter editor
for human reading/comprehension:a real problem!!
XML Introduction
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Advantage of XML over binary formats
Example: classML v.s .clss file format. swlml v.s swf (Flash file format)
advantage: readable; editable (free and) open software and APIs available
disadvantage: take longer time to parse.
The trend: one data model/ multi representation formats + converters among the formats.
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Core specifications for XML
XML 1.0XML NamespaceXML Path language (XPath)XML Stylesheet Langugae (XSL)
XSL Transformation language (XSLT) XSL formating Objects (XSLFO)
XML Linking language (XLink)XML Pointer Langugae (XPointer)XML schemas (; RelaxNG)XHTMLXML signatures/canonicalizationXML protocolsXMLFormXQuery (XML language for Querying XML Documents)
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Core Specifications for XML
XML document type definition (DTD) : a utility used to define the formats a
nd contents of valid XML documents. a specification to define what kinds of texts are well-formed XML doc
ument
XML namespace Define a mechanism to avoid collision of elements and/or attribute na
mes in documents using multiple sets of DTDs.
Xlink Define the mechanism for linking to web resources from an XML doc
ument.
Xpointer Define a mechanism for linking to inside an XML document.
XPath Define a mechanism to refer to part of an XML document
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XSL ( XML Stylesheet Language)
a language for expressing stylesheets. consists of two parts:
XSLT : a language (in XML format) used to describe how to transform an XML document into one in XML or non-XML format.
XSLFO: an XML vocabulary for specifying formatting semantics.
An XSL stylesheet specifies the presentation of a class of XML documents by describing how an instance of the class is transformed into an XML document that uses the formatting vocabulary.
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XML Introduction
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XML Schema A planned replacement of DTD. used to define the structures and formats of various mess
ages encoded in XML format.
consists of three documents: Part 0: a primer
an easy-to-understand introcuction
Part 2: Datatypes define tens of frequently used bulit-in datatypes
Part 3: structures specifies the XML Schema definition language, offers facilities f
or describing the structure and constraining the contents of XML documents
XML Introduction
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API for XML documents
DOM (level 1 & 2) : Document Object Model Tree-based XML API language independent
SAX (version 1 & 2) : Simple API for XML Document, Event-based XML API
JDOM, dom4j (XML APIs for Java) DOM for Java Tree-based, simpler version of DOM easier to use than DOM, suitable for Java only
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How can XML be used ?
XML was designed to store, carry and exchange data. It was not designed to display data.
XML is used to Exchange Data With XML, data can be exchanged between incompatible
systems. XML and B2B : With XML, financial information can be
exchanged over the Internet.
XML can be used to Share Data With XML, plain text files can be used to share data.
XML can be used to Store Data With XML, plain text files can be used to store data.
XML can be used to Create new Languages XML is the mother of WAP and WML.
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XML can make your Data more Useful With XML, your data is available to more users.
For sensible developers All sensible developers should have all their
future applications exchange data in XML.
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What can we do about XML
XML document design/application development XMLize legacy system data/database
一般企業 : 之 人事 庫存 客戶 產品 產品使用手冊 公文 醫院 學校 政府機關 ( 戶政 地政 稅捐 ...) : 病例 藥品 課程 戶籍 地籍 稅務
Design standard XML format for various domains order, transaction, billing, product for business domain mathematical formula, chemical formula in science Graph/graphics markup language ; Others:
XML processing tools: XML parser; XML editors; XML-existing format converter XML2HTML; DTD2DCD ; DCDeditor Various Domain-specific XML rendering tools
graphical XML --> Graphic DTD manager, schema tools, soap processor, web service tools/IDE/sys
temXML-enabled services/applications:
make your application software capable of serving request from internet (without special prerequisite) and requesting other internet on-line service.
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XML information
Java Sun’s java site: (http://java.sun.com/) The java tutorial (http://java.sun.com/docs/books/tutorial/)
is a nice book to begin with.
Information sources on XML: W3C site: http://www.w3.org/TR/ SGML/XML home page: http://www.oasis-open.org/cover/ XML com: http://www.xml.com/ XML university: http://www.xmlu.com/ XML page of leading computer companies
Microsoft: http://www.microsoft.com/xml/ IBM: http://www.software.com/xml/ sun: ....
See the course page for more.
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XML applications
XML as an alternative representation format (SVG) Scalar Vector Graph : for vector graph (MathML) : for mathematical expressions SMIL (Synchronized Multimedium Integration language): Resource Description Framework (RDF) : an XML language for descri
bing web resources and their relationship CML (Chemical Markup Language) : for chemical molecule JCML : XML format for java bytecodes (object code) JavaML : for java programs Ant : a replacement of make for java OOML : a OO PL in XML UIML : user interface Markup language WAP WML (Wireless Markup Langugae)
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A partial list of XML applications and industry initiatives W3C Specifications Documentation Text Encoding Initiative (TEI) XCES: Corpus Encoding Standard for XML Encoding and Markup for Texts of the Ancient Near East Electronic Text Corpus of Sumerian Literature (ETCSL) Perseus Project Channel Definition Format, CDF (Based on XML) RDF Rich Site Summary (RSS) Open Content Syndication (OCS) Web Modeling Language (WebML) Portable Site Information (PSI) XHTML and 'XML-Based' HTML Modules W3C Document Object Model (DOM), Level 1 Specification Web Collections using XML Meta Content Framework Using XML (MCF) XML-Data Namespaces in XML Resource Description Framework (RDF) Ontology Interchange Language (OIL) The Australia New Zealand Land Information Council (ANZLIC) - Metadata Alexandria Digital Library Project ATLA Serials Project (ATLAS)
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XML in law
BiblioML - XML for UNIMARC Bibliographic Records Medlane XMLMARC Experiment - MARC to XML e-Government Interoperability Framework (e-GIF) US Federal CIO Council XML Working Group XML Metadata Interchange Format (XMI) - Object Management Group (OMG) OMG Common Warehouse Metadata Interchange (CWMI) Specification Object Management Group XML/Value RFP MDC Open Information Model (OIM) Dublin Core Metadata Initiative (DCMI) Open Archives Metadata Set (OAMS) Publishing Requirements for Industry Standard Metadata (PRISM) Platform for Internet Content Selection (PICS) XML and Petri Nets Outline Processor Markup Language (OPML) ParlML: A Common Vocabulary for Parliamentary Language Legal XML Working Group COSCA/NACM JTC XML Court Filing Project New Mexico District Court XML Interface (XCI)
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XML and multimedia
Synchronized Multimedia Integration Language (SMIL) Multimodal Presentation Markup Language (MPML) Moving Picture Experts Group: MPEG-7 Standard DIG35: Metadata Standard for Digital Images W3C Scalable Vector Graphics (SVG) Precision Graphics Markup Language (PGML) Vector Markup Language (VML) Image Markup Language (IML) VRML (Virtual Reality Modeling Language) and X3D Extensible Graph Markup and Modeling Language (XGMML) Structured Graph Format (SGF) Graph Exchange Language (GXL) Petri Net Markup Language (PNML)
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XML in chemistry and biochemistry
Georgia State University Electronic Court Filing Project Web Standards Project (WSP) Open Software Description Format (OSD) XLF (Extensible Log Format) Initiative ALURe (Aggregation and Logging of User Requests) XML Specification Apache XML Project WAP Wireless Markup Language Specification The SyncML Initiative Materials Property Data Markup Language (MatML) Measurement Units Markup Language XML-Based 'eStandard' for the Chemical Industry Chemical Markup Language Molecular Dynamics [Markup] Language (MoDL) StarDOM - Transforming Scientific Data into XML Bioinformatic Sequence Markup Language (BSML) BIOpolymer Markup Language (BIOML) CellML Gene Expression Markup Language (GEML) Genome Annotation Markup Elements (GAME)
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XML and Finance
Microarray Markup Language (MAML) XML for Multiple Sequence Alignments (MSAML) Systems Biology Markup Language (SBML) OMG Gene Expression RFP Taxonomic Markup Language XDELTA: XML Format for Taxonomic Information Virtual Hyperglossary (VHG) Weather Observation Definition Format (OMF) Open Philanthropy Exchange (OPX) Open Financial Exchange (OFX/OFE) Interactive Financial Exchange (IFX) FinXML - 'The Digital Language for Capital Markets' Investment Research Markup Language (IRML) Extensible Financial Reporting Markup Language (XFRML) Extensible Business Reporting Language (XBRL) XMLPay Specification Trading Partner Agreement Markup Language (tpaML) Internet Open Trading Protocol (IOTP) Financial Products Markup Language (FpML)
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XML messaging ( or XML Protocols)
XML Mail Transport Protocol (XMTP) for XML SMTP and MIME Representation HTML Threading - Use of HTML in Email XML Messaging (IETF) Jabber XML Protocol XML Messaging Specification (XMSG) M Project: Java XML-Based Messaging System HTTP Distribution and Replication Protocol (DRP) Information and Content Exchange (ICE)
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FAML DTD for Financial Research Documents Mortgage Bankers Association of America MISMO Standard Digital Property Rights Language (DPRL) Extensible Rights Markup Language (XrML) Open Digital Rights Language (ODRL) Research Information Exchange Markup Language (RIXML) Data Link for Intermediaries Markup Language (daliML) XML-MP: XML Mortgage Partners Framework EcoKnowMICS ML Electronic Book Exchange (EBX) Working Group FIXML - A Markup Language for
the FIX Application Message Layer Bank Internet Payment System (BIPS) smartX ['SmartCard'] Markup Language (SML)
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Secure XML
XML and Encryption XML Digital Signature (Signed XML - IETF/W3C) XML Key Management Specification (XKMS) Security Services Markup Language (S2ML) AuthXML Standard for Web Security Digital Signatures for Internet Open Trading Protocol (IOTP) XML Encoding of SPKI Certificates Digital Receipt Infrastructure Initiative Digest Values for DOM (DOMHASH) Signed Document Markup Language (SDML)
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Real Estate Transaction Markup Language (RETML) OpenMLS and RELML (Real Estate Listing Markup Language) Data Consortium (Real Estate Standards) Comprehensive Real Estate Transaction Markup Language (CRTML) ACORD - XML for the Insurance Industry iLingo XML Schemas for Insurance Customer Profile Exchange (CPEX) Working Group Customer Support Consortium XML for the Automotive Industry - SAE J2008 Spacecraft Markup Language (SML) XML.ORG - The XML Industry Portal X-ACT - XML Active Content Technologies Council Electronic Business XML Initiative (ebXML) BASDA eBIS-XML Portal Markup Language (PML) EDGARspace Portal DII Common Operating Environment (COE) XML Registry StarOffice XML File Format Open eBook Initiative ONIX International XML DTD NISO Digital Talking Books (DTB)
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OpenMath Standard OMDoc: A Standard for Mathematical Documents Mathematical Markup Language Re-Useable Data Language (RDL)" OpenTag Markup Metadata - PICS MIX - Mediation of Information Using XML CDIF XML-Based Transfer Format Covad xLink API (XML-Based DSL Provisionin
g) WebBroker: Distributed Object Communication on the Web Web Interface Definition Language (WIDL) Global Engineering Networking Initiative (GEN) XML/EDI - Electronic Data Interchange XML/EDI Repository Working Group
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Global Uniform Interoperable Data Exchange (GUIDE) BizCodes Initiative Universal Data Element Framework (UDEF) European XML/EDI Workshop EEMA EDI/EC Work Group - XML/EDI ANSI ASC X12/XML and DISA OpenTravel Alliance (OTA) Hospitality Industry Technology Integration Standards (HITIS) Project Open Catalog Protocol (OCP) eCatalog XML (eCX) vCard Electronic Business Card Customer Identity / Name and Address Markup Language (CIML, NAML) AND Global Address XML Definition Historical Event Markup and Linking iCalendar XML DTD
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EC FrameWorks
CommerceNet Industry Initiative eCo Interoperability Framework Specification BizTalk Framework eCo Framework Project and Working Group Commerce XML (cXML) SMBXML: An Open Standard for Small to Medium Sized Businesses RosettaNet
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XML Encoded Form Values Capability Card: An Attribute Certificate in XML Telecommunications Interchange Markup (TIM, TCIF/IPI) aecXML Working Group - Architecture, Engineering and Construction Building Construction Extensible Markup Language (bcXML) MasterBuilder Construction Management and Accounting Green Building XML (gbXML) Product Data Markup Language (PDML) Product Definition Exchange (PDX) Electronic Component Information Exchange (ECIX) and Pinnacles Component Information
Standard (PCIS) ECIX QuickData Specifications ECIX Component Information Dictionary Standard (CIDS) ECIX Timing Diagram Markup Language (TDML) XML and Electronic Design Automation (EDA) Encoded Archival Description (EAD) UML eXchange Format (UXF) XML Data Binding Specification Translation Memory eXchange (TMX) P3P Specification: Platform for Privacy Preferences Extensible Name Service (XNS) Dialogue Moves Markup Language (DMML)
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Scripting News in XML InterX.org Initiative Document Encoding and Structuring Specification for Electronic Recipe Transfer (DESSE
RT) NuDoc Technology Coins: Tightly Coupled JavaBeans and XML Elements DMTF Common Information Model (CIM) Universal Plug and Play Forum XML Transition Network Definition (XTND) Process Interchange Format XML (PIF-XML) (XML) Topic Maps DARPA Agent Mark Up Language (DAML) Rule Markup Language (RuleML) Relational-Functional Markup Language (RFML) Ontology and Conceptual Knowledge Markup Languages Information Flow Framework Language (IFF) Simple HTML Ontology Extensions (SHOE) XOL - XML-Based Ontology Exchange Language Description Logics Markup Language (DLML) Case Based Markup Language (CBML) Artificial Intelligence Markup Language (AIML) Physics Markup Language (PhysicsML)
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Procedural Markup Language (PML) QAML - The Q&A Markup Language LACITO Projet Archivage de données linguistiques sonores et textuelles [Linguistic Data
Archiving Project] Geography Markup Language (GML) LandXML Navigation Markup Language (NVML) Extensible Data Format (XDF) Gemini Observatory Project NASA Goddard Astronomical Data Center (ADC) 'Scientific Dataset' XML Extensible Scientific Interchange Language (XSIL) Object Oriented Data Technology (OODT) and XML Astronomical Markup Language Astronomical Instrument Markup Language (AIML) GedML: [GEDCOM] Genealogical Data in XML adXML.org: XML for Advertising Newspaper Association of America (NAA) - Standard for Classified Advertising Data News Industry Text Format (NITF) XMLNews: XMLNews-Story and XMLNews-Meta NewsML and IPTC2000 News Markup Language (NML) Notes Flat File Format (NFF)
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Java Help API Cold Fusion Markup Language (CFML) Document Content Description for XML (DCD) XSchema Document Definition Markup Language (DDML) Character Mapping Markup Language (CharMapML) WEBDAV (IETF 'Extensions for Distributed Authoring and Versioning on the World Wide
Web') DAV Searching and Locating (DASL) Graphic Communications Association - GCA 'Paper' DTD DocBook XML DTD Apache Cocoon JavaDoc Documentation in XML JDox: XML Format for Sun Javadoc XML for Publishers and Printers (XPP) Job Definition Format (JDF) Printing Industry Markup Language (PrintML) PML: Markup Language for Paper and Printing PrintTalk Consortium printcafe eProduction eCommerce eXchange (PCX) IEEE LTSC XML Ad Hoc Group Universal Learning Format Technical Specification
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Educom Instructional Management Systems Project (IMS) Metadata Specification Learning Material Markup Language (LMML) Tutorial Markup Language (TML) International Development Markup Language (IDML) Call Processing Language (CPL) Call Policy Markup Language (CPML) VoiceXML Forum (Voice Extensible Markup Language Forum) VoxML Markup Language Telephony Markup Language (TML) DARPA Communicator Project and XML Log Standard Multilevel Annotation, Tools Engineering (MATE) Computing Environment for Linguistic, Literary, and Anthropological Research (CELLAR) Architecture and Tools for Linguistic Analysis Systems (ATLAS) TalkBank and the Codon XML-Based Annotation Framework ACE Pilot Format DTDs Transcriber - Speech Segmentation and Annotation DTD Natural Language Semantics Markup Language Extensible Telephony Markup Language (XTML) SABLE: A Standard for Text-to-Speech Synthesis Markup Speech Synthesis Markup Language Specification for the Speech Interface Framework Java Speech Markup Language (JSML/JSpeech) SpeechML
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TalkML Project Management XML Schema XML for Workflow Management [NIST] SWAP - Simple Workflow Access Protocol XML-Based Workflow [Process Management] Standard: Wf-XML Exchangeable Routing Language (XRL) Architecture Description Markup Language (ADML) Theological Markup Language (ThML) LitML: A Liturgical Markup Language XML-F ('XML for FAX') XML and Forms XHTML-FML: Forms Markup Language Extensible Forms Description Language (XFDL) XML Forms Architecture (XFA)Electronic Form System (EFS) Broadcast Hypertext Markup Language (BHTML) IEEE Standard DTD Open Settlement Protocol (OSP) - ETSI/TIPHON Directory Services Markup Language (DSML) DIF Directory Interoperability Proposal XML DTD for ACAP - ACAP Data Interchange Format WDDX - Web Distributed Data Exchange XIOP - XML Corba Environment-Specific Inter-ORB Protocol
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XML-RPC Blocks eXtensible eXchange Protocol Framework (BEEP) Layered Object Transport Protocol (LOTP) XML for Exchange of Structure and Identification of Management Information (SMI) WorldOS Business Process Modeling Language (BPML) Business Rules Markup Language (BRML) Common Business Library (CBL) Universal Commerce Language and Protocol (UCLP) VISA XML Invoice Specification First Retail Mark-up Language Open Applications Group - OAGIS Schema for Object-oriented XML (SOX) XMLTP.Org - XML Transfer Protocol The XML Bookmark Exchange Language (XBEL) Simple Object Definition Language (SODL) and XMOP Service Simple Object Access Protocol (SOAP) Universal Description, Discovery, and Integration (UDDI) Web Services Description Language (WSDL) Extensible Provisioning Protocol (EPP) Transaction Authority Markup Language (XAML) XML Encoding Rules for ASN.1 (XER)
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Object-Oriented Programing Meta-Language (OOPML) XML and Music FlowML: A Format for Virtual Orchestras Clinical Data Interchange Standards Consortium National Library of Medicine (NLM) XML Data Formats ISIS European XML/EDI Healthcare Pilot Project (XMLEPR) Open Healthcare Group 'XChart' DocScope: Open Source XML Healthcare Project Health Level Seven XML Patient Record Architecture ASTM XML Document Type Definitions (DTDs) for Health Care The CISTERN Project - Standard XML Templates for Healthcare Template Definition Language (TDL) Human Resource Management Markup Language (HRMML) HR-XML Consortium XML-HR Initiative - Human Resources Rosetta Group XML Résumé Library ECMData - Electronic Component Manufacturer Data Sheet Inventory Specification Bean Markup Language (BML) The Koala Bean Markup Language (KBML) Jigsaw XML Format (JigXML) Chinese XML Now! MOS-X (Media Object Server - XML)
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FLBC (Formal Language for Business Communication) and KQML ISO 12083 XML DTDs Electronic Thesis and Dissertation Markup Language (ETD-ML) Extensible User Interface Language (XUL) The Extensible Bindings Language (XBL) User Interface Markup Language (UIML) Process Specification Language (PSL) and XML Steel Markup Language (SML) Energy Trading Standards Group (ETSG) Petrotechnical Open Software Corporation (POSC) XML Related Projects PetroXML Initiative Partner Interface Process for Energy (PIPE) Marine Trading Markup Language (MTML) Navy CALS Initiatives XML eFirst XML for Scholarly Articles XML DTD for Phone Books Using XML for RFCs Schools Interoperability Framework (SIF) Guideline XML (gXML) Extensible Protocol XML Belief Network File Format (Bayesian Networks)
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Predictive Model Markup Language (PMML) Data Documentation Initiative: A Project of the Social Science Community XML and 'The Semantic Web' XML and Attribute Grammars XML and Databases SODA2 - An XML Semistructured Database System RAX - Record API for XML XML and CORBA Chess Markup Language (ChessML) Mind Reading Markup Language (MRML)
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XML in EDA (Electric Design Automation)
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A sketch of the XML Syntax
XML is a simple data format that balances the needs of people to read/write data with the needs of machines to read/write data.
-- Dan Connolly, W3C
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A sketch of XML Syntax
An example XML document:<?xml version="1.0"?> <note> <to>Cheng</to> <from>Chen</from> <heading>Reminder</heading> <body>Don't forget me this
weekend!</body> </note> Notes:1. The XML declaration should always be
included. 2. <note>…</root> is the root element which
has 4 children.
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<!– the structure of the document element -->
<department>
<employee id="J.D">
<name>John Doe</name>
</employee>
<employee id="A.M“ id-no =“L12345678” >
<name>Alice Miller</name>
<url href="http://www.trl.jp.ibm.com/~amiller/"/>
</employee>
</department>
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<!– the structure of the document element -->
The root or document element
Element type (or name)
child element
Attributes
attribute valueattribute name
<department> start tag
<employee id="J.D">
<name>John Doe</name>
</employee>
<employee id="A.M“ id-no =“L12345678” >
<name>Alice Miller</name>
<url href="http://www.trl.jp.ibm.com/~amiller/"/>
</employee>
</department> end-tag
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All XML elements must have a closing tag
In HTML some elements do not have to have a closing tag. The following code is legal in HTML:
<p>This is a paragraph <p>This is another paragraph
In XML all elements must have a closing tag like this:
<p>This is a paragraph</p> <p>This is another paragraph</p>
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XML tags are case sensitive
XML tags are case sensitive. The tag <Letter> is different from the tag
<letter>.Opening and closing tags must be written
with the same case: <Message>This is
incorrect</message> <message>This is
correct</message>
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All XML elements must be properly nested
In HTML some elements can be improperly nested within each other like this:
<b><i>This text is bold and italic</b></i>
In XML all elements must be properly nested within each other like this
<b><i>This text is bold and italic</i></b>
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All XML documents must have a root tag
All XML documents must contain a single tag pair to define the root element. All other elements must be nested within the root element. All elements can have sub (children) elements. Sub elements must be in pairs and correctly nested within their parent element:
<root> <child> <subchild> </subchild>
</child> </root>
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Attribute values must always be quoted
XML elements can have attributes in name/value pairs just like in HTML. In XML the attribute value must always be quoted. Study the two XML documents below. The first one is incorrect, the second is correct:
<?xml version="1.0"?> <note date= 12/11/99> <to>Tove</to><from>Jani</from> <heading>Reminder</heading> <body>Don't forget me this weekend!</body> </note><?xml version="1.0"?> <note date="12/11/99"> <to>Tove</to><from>Jani</from> <heading>Reminder</heading> <body>Don't forget me this weekend!</body> </note>
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XML Attributes
normally used to describe XML elements, orto provide additional information about elements. From HTML you can remember this construct:
<IMG SRC="computer.gif">In this HTML example:
SRC is an attribute to the IMG element. he SRC attribute provides additional information about th
e element.
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XML Attributes
Attributes are always contained within the start tag of an element. Here are some examples:
HTML examples: <img src="computer.gif"> <a href="demo.asp">
XML examples: <file type="gif"> <person id="3344">
Attributes are usually used to provide information that is not a part of the content of the XML document. I.e. Often attribute data is more important to the XML parser than to the r
eader. in the example above, the person id is a counter value that is irreleva
nt to the reader, but important to software that wants to manipulate the person element.
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Use of Elements vs. Attributes
Examples:Using an Attribute for sex: <person sex="female"> <firstname>Anna</firstname> <lastname>Smith</lastname> </person> Using an Element for sex: <person> <sex>female</sex> <firstname>Anna</firstname> <lastname>Smith</lastname> </person>
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XML Validation
Well-Formed XML documentsA Well-Formed XML document is a document that c
onforms to the XML syntax rules that we have described .
The following is a Well-Formed XML document:
<?xml version="1.0"?> <note> <to>Tove</to> <from>Jani</from> <heading>Reminder</heading> <body>Don't forget me this weekend!</body> </note>
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Valid XML documents
A Valid XML document is a Well-Formed XML document which conforms to the rules of a Document Type Definition (DTD).
The following is the same document as above but with an added reference to a DTD:
<?xml version="1.0"?> <!DOCTYPE note SYSTEM "InternalNote.dtd"> <note> <to>Tove</to> <from>Jani</from> <heading>Reminder</heading> <body>Don't forget me this weekend!</body> </note>
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DTD - Table of Contents
Introduction to DTD An introduction to the XML Document Type Definition.
DTD - XML Building Blocks What XML building blocks are defined in a DTD. DTD Elements How to define the elements of an XML document using DTD. DTD Attributes How to define the legal attributes of XML elements using
DTD. DTD Entities How to define XML entities using DTD. DTD Validation How to test for DTD errors while loading XML documents. DTD Examples Some DTD examples.
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Introduction to DTD
The purpose of a DTD is to define the legal building blocks of an XML document.
It defines the document structure with a list of legal elements.
A DTD can be declared inline in your XML document, or as an external reference.
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Internal DTD
This is an XML document with a Document Type Definition: (Open it in IE5, and select view source)
<?xml version="1.0"?> <!DOCTYPE note [ <!ELEMENT note (to,from,heading,body)> <!ELEMENT to (#PCDATA)> <!ELEMENT from (#PCDATA)> <!ELEMENT heading (#PCDATA)> <!ELEMENT body (#PCDATA)> ]> <note> <to>Tove</to> <from>Jani</from> <heading>Remind
er</heading> <body>Don't forget me this weekend!</body> </note>
The DTD is interpreted like this:!ELEMENT note (in line 2) defines the element "note" as having four elements: "to,from,heading,body". and so on.....
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External DTD
This is the same XML document with an external DTD: (Open it in IE5, and select view source)
<?xml version="1.0"?><!DOCTYPE note SYSTEM "note.dtd"><note> <to>Tove</to> <from>Jani</from><heading>Reminder</heading> <body>Don't forget me this weekend!</body> </note>
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note.dtd
This is a copy of the file "note.dtd" containing the Document Type Definition:
<?xml version="1.0"?> <!ELEMENT note (to,from,heading,body)> <!ELEMENT to (#PCDATA)> <!ELEMENT from (#PCDATA)> <!ELEMENT heading (#PCDATA)> <!ELEMENT body (#PCDATA)>
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Why use a DTD?
XML provides an application independent way of sharing data.
With a DTD, independent groups of people can agree to use a common DTD for interchanging data.
Your application can use a standard DTD to verify that data that you receive from the outside world is valid. You can also use a DTD to verify your own data.
A lot of forums are emerging to define standard DTDs for almost everything in the areas of data exchange. Take a look at: CommerceNet's XML exchange and http://www.schema.net.
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DTD - XML building blocks
The building blocks of XML documentsXML documents (and HTML documents) are made
up by the following building blocks: Elements, Tags, Attributes, Entities, PCDATA, and CDATA
This is a brief explanation of each of the building blocks:
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Elements
Elements are the main building blocks of both XML and HTML documents.
Examples of HTML elements are "body" and "table". Examples of XML elements could be "note" and "m
essage".Elements can contain text, other elements, or be em
pty.Examples of empty HTML elements are "hr", "br" an
d "img".
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Tags
Tags are used to markup elements.A starting tag like <element_name> mark up the beg
inning of an element, and an ending tag like </element_name> mark up the en
d of an element.Examples:
A body element:
<body> body text in between</body>.A message element:
<message> some message in between</message>
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Attributes
Attributes provide extra information about elements.Attributes are placed inside the start tag of an elem
ent.Attributes come in name/value pairs. The following "img" element has an additional infor
mation about a source file:
<img src="computer.gif" />Notes:
The name of the element is "img". The name of the attribute is "src". The value of the attribute is "computer.gif". Since the element itself is empty it is closed by a " /".
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PCDATA
PCDATA means parsed character data.Think of character data as the text found between
the start tag and the end tag of an XML element.PCDATA is text that will be parsed by a parser. Tags inside the text will be treated as markup and
entities will be expanded.
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CDATA
CDATA also means character data.CDATA is text that will NOT be parsed by a parser. Tags inside the text will NOT be treated as markup
and entities will not be expanded.
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Entities
Entities as variables used to define common text. Entity references are references to entities.Most of you will known the HTML entity reference: " "
that is used to insert an extra space in an HTML document. Entities are expanded when a document is parsed by an XML
parser.The following entities are predefined in XML:Entity References Character
< <
> >
& &
" "
' '
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DTD - Elements
Declaring an ElementIn the DTD, XML elements are declared with an
element declaration. An element declaration has the following syntax:
<!ELEMENT element-name (element-content)>
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Empty elements
Empty elements are declared with the keyword EMPTY inside the parentheses:
<!ELEMENT element-name (EMPTY)>example:
<!ELEMENT img (EMPTY)>
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Elements with data
Elements with data are declared with the data type inside parentheses:<!ELEMENT element-name (#CDATA)> or <!ELEMENT element-name (#PCDATA)> or<!ELEMENT element-name (ANY)>
Example:<!ELEMENT note (#PCDATA)>1. #CDATA means the element contains character
data that is not supposed to be parsed by a parser.
2. #PCDATA means that the element contains data that IS going to be parsed by a parser.
3. The keyword ANY declares an element with any content.
4. If a #PCDATA section contains elements, these elements must also be declared.
