XML is a general-purpose specification for creating custom mark-up languages. It is classified as an extensible language because it allows its users to define their own elements. Its primary purpose is to help information systems share structured data, particularly via the Internet, and it is used both to encode documents and to serialize data.
As a diverse platform, Java has several solutions for working with XML. This refcard provides developers a concise overview of the different xml processing technologies in Java, and a use case of each technology. All of these parsers fall under JAXP implementation.
For using SAX, we need the parser and an event handler that should respond to the parsing events. Events can be a start element event, end element event, and so forth. StAX is a streaming pull parser. It means that the parser client can ask the parser to go forward in the document when it needs. Elements defined in a DTD can be used, along with the predefined tags and attributes of each markup language. XSD provides the syntax and defines a way in which elements and attributes can be represented in a XML document. It also advocates the XML document should be of a specific format and specific data type.
XPath is a declarative language used for referring to sections of XML documents. XPath expressions are used for locating a set of nodes in a given XML document. Over a million developers have joined DZone. SAVE 55k Free. PDF for easy Reference. Written by. Table of Contents. Section 1. Section 2. This prolog can be minimal, e. All other elements reside inside the root element. Line Element: An element is composed of its start tag, end tag and the possible content which can be text or other nested elements.
End tag must be namespace prefixed in order to get a document, the end tag is line Line Attribute: an attribute is part of an element, consisting of an attribute name and its value. Use XML when you need to support or interact with multiple platforms. Use XML as the preferred output format when multiple output formats are required. Content size Use XML when messaging and processing efficiency is less important than interoperability and availability of standard tools.
Large content can create a big XML document. For small projects with simple requirements, you might not want to incur the overhead of XML. Section 3. There are two general parsing techniques: In Memory Tree: The entire document is read into memory as a tree structure which allows random access to any part of the document by the calling application.
Streaming Event processing : A Parser reads the document and fires corresponding event when it encounters XML entities. Two types of parsers use streaming techniques: Push parsers: Parsers are in control of the parsing and the parser client has no control over the parsing flow. Pull parsers: The Parser client is in control of the parsing and the parser goes forward to the next infoset element when it is asked to.
Following are parsers generally available in the industry: DOM: DOM is a tree-based parsing technique that builds up an entire parse tree in memory.
It allows complete dynamic access to a whole XML document. Rather than building a tree representation of an entire document as DOM does, a SAX parser fires off a series of events as it reads through the document. So there is no event firing by the parser or huge memory consumption. Section 4.
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To validate a document using DOM, ensure that there is no schema in the document, and no element prefix for our start and end tags. Line The created parser is namespace aware the namespace prefix will be dealt with as a prefix, and not a part of the element. Lines 18 — The created parser uses internal XSD to validate the document Dom BuilderFactory instances accept several features which let developers enable or disable a functionality, one of them is validating against the internal XSD.
The default handler has different behaviors based on the implementation that we use. Section 5. Section 6. Iterator-based API which represents the current state of the parser as an Object.
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The parser client can get all the required information about the element underlying the event from the object. Section 7. Section 8. There are two levels of correctness of an XML document: Well-formed-ness.
For example, if a start-tag appears without a corresponding end-tag, it is not well-formed. A document that is not well-formed is not considered to be XML. A valid document conforms to semantic rules. Examples of invalid documents include: if a required attribute or element is not present in the document; if the document contains an undefined element; if an element is meant to be repeated once, and appears more than once; or if the value of an attribute does not conform to the defined pattern or data type.
No type definition system. Can be used as an in-line definition inside the XML documents. No means of element and attribute content definition and validation. December 20, Stylus Studio, an industry leading provider of XML tools and data integration components, received the Product of the Year Award for Web Development from CRN Magazine, the newsweekly of vital information for business and technology integrators.
December 7, September 28, September 1, My assumption was that I would have a nice IDE, some nice color coding display and perhaps a wizard or two. Boy was I wrong.
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April 18, WebProNews Reports: "A recently released report by ZapThink touts the ability of DataDirect's standards-based XQuery, a java component for integrating relational and XML data, to address the challenges involved in data integration and allow the user to determine runtime infrastructure. April 7, April 4, And those same programs can write output through the adapter, generating EDI transparently and automatically. April 1, March 29, March 27, Stylus' XML Schema editor is simple to use February 6, The user interface of the Integrated Development Environment is beautiful".
Sys-Con Australia: "Anyone interested in knowing how to get started with XQuery, or what features are upcoming, will be pleased to know that there's a new interview with XQuery co-inventor Jonathan Robie just gone online. December 15, December 1, These Java components provide bi-directional, programmatic access to virtually any data source as XML.
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November 23, Whether you've heard about it or not, though, anybody who works with XML would do well to check out Stylus Studio XML Enterprise Edition , a major release that just came out last week. Just as it always has, Stylus Studio cuts your dev time by giving you stable, intuitive, well-designed tools that work the way you expect them to, but this release adds even better standards conformance and a lot of new functionality, including powerful XML Converters, screen-saving XML code-folding, a new EDI conversion and validation wizard, and updated XQuery 1.
November 22, XML use is widespread across modern information systems in all industry, government, and academic sectors. XML is also the basis for a growing body of industry standards for data exchange, and it is well on its way to becoming a mainstream technology for data integration.
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XML is transforming not just data - it is transforming information processing in general. November 16, Larry also pointed out that not only was XQuery a very compact language, but it could be applied to groups of XML files, different from the usual file-at-a-time orientation of other XML standards. November 11, The new release provides a significant upgrade in usability and XML standards conformance, and many new features further simplify XML data integration tasks faced by developers.
November 3, October 17, October 4, September 6, The Stylus Studio Web site published a new article from Dr.