In addition, whitespace before and after the outermost element is classified as markup. However, in a CDATA section, the delimiters are classified as markup, while the text between them is classified as content. Strings of characters that are not markup are content. Generally, strings that constitute markup either begin with the character, or they begin with the character & and end with a. Markup and content The characters making up an XML document are divided into markup and content, which may be distinguished by the application of simple syntactic rules. The processor (as the specification calls it) is often referred to colloquially as an XML parser. The specification places requirements on what an XML processor must do and not do, but the application is outside its scope. Processor and application The processor analyzes the markup and passes structured information to an application. Almost every legal Unicode character may appear in an XML document. This is not an exhaustive list of all the constructs that appear in XML it provides an introduction to the key constructs most often encountered in day-to-day use.Ĭharacter An XML document is a string of characters. The material in this section is based on the XML Specification. XML is used extensively to underpin various publishing formats. In publishing, Darwin Information Typing Architecture is an XML industry data standard. Many industry data standards, such as Health Level 7, OpenTravel Alliance, FpML, MISMO, and National Information Exchange Model are based on XML and the rich features of the XML schema specification. It is the message exchange format for the Asynchronous JavaScript and XML (AJAX) programming technique. XML also provides the base language for communication protocols such as SOAP and XMPP. Hundreds of document formats using XML syntax have been developed, including RSS, Atom, Office Open XML, OpenDocument, SVG, and XHTML. XML has come into common use for the interchange of data over the Internet. RFC 7303 further recommends that XML-based languages be given media types ending in +xml, for example, image/svg+xml for SVG.įurther guidelines for the use of XML in a networked context appear in RFC 3470, also known as IETF BCP 70, a document covering many aspects of designing and deploying an XML-based language. They are used for transmitting raw XML files without exposing their internal semantics. It defines two base media types: application/xml and text/xml. IETF RFC 7303 (which supersedes the older RFC 3023), provides rules for the construction of media types for use in XML message. (This is also referred to as the canonical schema.) : 135 An XML document that adheres to basic XML rules is "well-formed" one that adheres to its schema is "valid." : 135 : 11 An additional XML schema (XSD) defines the necessary metadata for interpreting and validating XML. What's within the tags is data, encoded in the way the XML standard specifies. : 11 XML tags represent the data structure and contain metadata. : 1Īs a markup language, XML labels, categorizes, and structurally organizes information. XML is analogous to a lingua franca for representing information.
For two disparate systems to exchange information, they need to agree upon a file format. storing, transmitting, and reconstructing arbitrary data. The main purpose of XML is serialization, i.e.
Rich text box in asp net free#
The World Wide Web Consortium's XML 1.0 Specification of 1998 and several other related specifications -all of them free open standards-define XML. It defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. Extensible Markup Language ( XML) is a markup language and file format for storing, transmitting, and reconstructing arbitrary data.
0 kommentar(er)
