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XML Ahmet Şentürk CmpE-587
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Content XML XML Syntax XML Core Technologies WebDAV XML Web Services
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What is XML self-describing documents textual markup (tags) a simplified version of SGML more suitable for use on the Web HTML provides rich facilities for display, it does not provide any standards-based way to manage data as data XML provides a data standard that can encode the content, semantics, and schemata for a wide variety of cases offers a universal way to describe and work with data
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Benefits Of XML provides a universal,powerful, flexible format for expressing data data delivered to the desktop can be manipulated locally Unicode a description of the structure of the data the data is now separate from the presentation XML offers a mechanism for adding meta-data or meta- content to HTML enables wide array of business applications to be implemented on the Internet
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XML Syntax for describing your data begin and end tags and attributes case-sensitive text-based (similar to HTML) white space considered well-formed if it contains exactly one root element and all the child elements are nested properly within each other
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XML Syntax store and transmit data an unlimited set of tags Strictly a Tree An example well-formed XML document CowBurger Greasy and good. 2.99
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XML Namespaces provide a context for your XML document elements resolve elements to a particular implementation semantic Price : Sale price or purchase price <hamburgers xmlns:purchase="http://fastfood.org/franchise/prices" xmlns:sales="http://fastfood.org/customer/prices"> CowBurger Greasy and good. 0.99 2.99
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XML Core Technologies Validation Technologies Schemas a formal specification of the rules of an XML document Document Type Definitions
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Hamburger.dtd #PCData (parsed character data)
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XML Core Technologies XML-Data </ElementType> </ElementType></Schema>
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XML Core Technologies Processor (API) Technologies DOM in-memory tree representation of the XML document
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XML Core Technologies Processor (API) Technologies SAX event-driven XML parsing doesn't require the entire XML file to be loaded into memory event handlers to just-in-time process
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XML Core Technologies Transformation Technologies XSL Patterns /hamburgers/hamburger[@lowfat="yes"]/price /hamburgers/hamburger[@lowfat="yes"]/price XSL XML File <hamburgers> CowBurger Greasy and good. 2.99 CowBurger Greasy and good. 2.99 </hamburgers>
![XML Core Technologies Transformation Technologies XSL Patterns yes ]/price yes ]/price XSL XML File <hamburgers> CowBurger Greasy and good.](http://images.slideplayer.com/22/6445232/slides/slide_13.jpg "2.99 CowBurger Greasy and good </hamburgers>.")
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XML Core Technologies XSL Transformation hamburgers hamburgers,,,, </xsl:for-each> </xsl:stylesheet>
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XML Core Technologies HTML Output<html><body><h1>hamburgers</h1><ol> CowBurger, $2.99, Greasy and good. CowBurger, $2.99, Greasy and good. </ol></body></html>
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XML Core Technologies Linking Technologies XLink XPointerchild(2,hamburger) Other Technologies Mathematical Markup Language (MathML) Synchronized Multimedia Integration Language (SMIL) Vector Markup Language (VML)
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WebDAV Web Distributed Authoring and Versioning Communicating XML Data over the Web an important communication protocol for the Web as an extension to HTTP 1.1 useful in client/server architecture
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WebDAV Protocol Problem HTTP for static documents intended for viewing “lost update” problem Three major major concerns of collaborative authoring in WebDAV Overwrite Protection Resource Management Document Properties
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The Format of WebDAV Requests set of methods that clients can use to communicate with servers Options, Head, and Trace Get Put and Post Delete Mkcol PropFind and PropPatch Copy and Move Lock and Unlock
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What XML Means to WebDAV HTTP communicate with headers WebDAV require a great deal of information to be associated with both requests and responses Because of its inherent extensibility, XML was chosen to describe how these instructions are communicated A method of formatting instructions describing how data is to be handled. A method of formatting complex responses from the server. A method of communicating customized information about the collections and resources handled. A flexible vehicle for the data itself.
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XML Web Services fundamental building blocks in the move to distributed computing on the Internet communication and collaboration among people and applications application integration constructed using multiple XML Web services from various sources work together regardless of where they reside or how they were implemented primary advantages allows programs written in different languages on different platforms to communicate with each other in a standards- based way
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XML Web Services many definitions : XML Web Services expose useful functionality to Web users through a standard Web protocol, SOAP. XML Web services provide a way to describe their interfaces in enough detail to allow a user to build a client application to talk to them, called a Web Services Description Language (WSDL) document XML Web services are registered so that potential users can find them easily, with Universal Discovery Description and Integration (UDDI).
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What Can I Do With XML Web Services information sources that you could easily incorporate into applications more powerful applications that use XML Web services as building blocks
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SOAP communication protocol for XML Web services defines the XML format for messages Remote Procedure Calls SOAP message containing a callable function parameters to pass to the function, is sent from the client server returns a message with the results of the executed function define security for web services
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Why Should I Use SOAP? implemented on many different hardware and software can be used to link separate systems RPC HTTTP
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WSDL a WSDL file is an XML document that describes a set of SOAP messages and how the messages are exchanged based on the XML Schema defines where the service is available and what communications protocol is used to talk to the service
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WSDL Document Structure Abstract Definitions (define SOAP messages ) Types : Machine- and language-independent type definitions Messages : Contains function parameters or documentdescripttions PortTypes : function signatures (operation name, input parameters, output pameters Concrete Descriptions Bindings : Specifies binding(s) of each operation Services : Specifies port address(es) of each binding, syntax for calling methods
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UDDI yellow pages of Web services Search web service Read about it Get more information about service to reach a significant market, you need UDDI an XML file that describes a business and the services it offers
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UDDI 3 parts of an entry in UDDI white pages : describe the company offering the service yellow pages : include industrial categories green pages : describe the interface to the service UDDI directory includes several ways to search for the services
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What XML Do You Post? SOAP Envelope … … </Envelope> Contents of body can be any query Microsoft Microsoft </find_business>
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How Do You Post the XML? Form a Jscript file or HTML page by XMLHTTP http = new ActiveXObject("Microsoft.XMLHTTP"); http.open("POST", url, false); http.setRequestHeader("Accept","text/xml"); http.setRequestHeader("Cache-Control","no-cache"); http.setRequestHeader("SOAPAction",'""'); http.send(msg);
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What Do You Get Back? XML of course <businessInfos> Microsoft Corporation Microsoft Corporation Empowering people through great software - any time, any place and on any device is Microsofts vision. As the worldwide leader in software for personal and business computing, we strive to produce innovative products and services that meet our customer's Empowering people through great software - any time, any place and on any device is Microsofts vision. As the worldwide leader in software for personal and business computing, we strive to produce innovative products and services that meet our customer's <serviceInfos> Web services for smart searching Web services for smart searching
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. NET application architecture multiple Web Services that work together to provide data and services for the application
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Generic Architecture for a Web Service
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Reliable XML Web Services Standards Based Acknowledged Delivery Ordered Delivery Symmetric Conversations Promotes Asynchronous Processing
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Synchronous Messaging The connection may be broken by an external source, dropping either the request or response The server may timeout because it is offline or overloaded The server process may be dependant upon down stream services that have uncontrollable response times.
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Synchronous Messaging
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Asynchronous Model
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