Schemas are intended to replace DTDs and do, in fact, subsume all DTD functionality in Visual Studio .NET

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Schemas are intended to replace DTDs and do, in fact, subsume all DTD functionality
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Processing XML Documents
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The two most popular programming APIs for parsing XML are the document object model (DOM) from W3C[5] and the Simple API for XML (SAX), which was collaboratively developed and is maintained by the members of the XML-DEV mailing list[6]
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See http://wwww3org/TR/DOM-Level-2-Core/ See http://wwwsaxprojectorg/
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DOM and SAX APIs allow parsing XML documents
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The major difference between SAX and DOM is that the DOM API provides a generic object model to represent the structure of documents and a standard set of interfaces for traversing and manipulating them Although vendors are free to use any data structures to support the standard DOM interfaces, most popular DOM implementations work only in main memory The SAX API, on the other hand, works by firing callback events into the application as the document is parsed, element by element SAX reads through once; DOM supports multiple traversals
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The SAX approach uses less memory and is more efficient for messaging and transformation, whereas the DOM API allows multiple passes through the document, using it more like an inmemory database, or a repository that can be searched multiple times In other words, if you're parsing the document only to do one thing with it, such as map it to an existing software program or database, SAX is probably more efficient But if you're using the
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Understanding Web Services- XML, WSDL, SOAP and UDDI
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document as a continuing source of data or as something with which to interact several times, DOM makes more sense SAX and DOM implementations are freely available for Microsoft and Java programming environments and are easily obtainable for other traditional or more specialized programming environments Basic XML handling is therefore becoming a commodity XML parsers are commodities
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Examples of DOM interfaces are Node, Element, and Document Everything in the document object model is considered a node, but some nodes are also called document elements For example, the root element is called the root element node and a document element Many more operations and interfaces are available in the complete list of DOM interfaces The following text contains a few simple examples: DOM APIs assume a hierarchical document model
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Node interface examples: +getParentNode() +getChildNodes() Element interface examples: +getAttributeNS() +setAttributeNS() Document interface examples: +createElement() +createAttribute()
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Sample SAX operations shown in the following example are from the ContentHandler, XMLReader, and Attributes interfaces:
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ContentHandler interface examples: +startDocument() +startElement() XMLReader interface examples: +getProperty() +setProperty() Attributes interface examples: +getValue() +getType()
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SAX APIs read through the document and process events
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Both SAX and DOM interfaces can be mixed in a single program Together, they provide XML processors with the capability to process documents linearly with greater efficiency and as a hierarchical information resource for multiple passes
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Understanding Web Services- XML, WSDL, SOAP and UDDI
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Namespaces
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Once you have multiple XML documents, you need a way to scope element names within each respective document Namespaces provide that mechanism and are also used for other purposes Namespaces scope, or qualify, element names
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XML namespaces create unique prefixes for elements in separate documents or applications that are used together Namespaces are also sometimes used as unique keywords that indicate specific processing semantics to be interpreted when the documents are processed Namespaces are used primarily to avoid problems that might be caused if the same element name appears in multiple related documents or document fragments This is a significant issue for Web services, as they often involve handling multiple related documents at the same time For example, a basic Web services interaction has at least four related documents:
n n n n
The instance document message carrying the data The SOAP envelope schema defining the message format The WSDL instance document describing the interface The WSDL schema validating the interface definition Namespaces avoid naming clashes when multiple documents are processed
Depending on the use of other optional technologies, there can easily be many more documents, each distinguished using its own namespace Some namespaces will be given to you, but others you will have to make up Namespaces are usually modeled as uniform resource indicators (URIs)[7] in the familiar format of the Web For example:
URIs include uniform resource locators (URLs), which point to files and other Web resources, and uniform resource names (URNs), which are simply names and don't point to anything In practice, however, URIs can be considered equivalent to URLs
xmlns:myns="http://wwwxmlbuscom/namespaces/WSDL"