They are used for transmitting raw XML files without exposing their internal semantics. It defines three media types: application/xml ( text/xml is an alias), application/xml-external-parsed-entity ( text/xml-external-parsed-entity is an alias) and application/xml-dtd. 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. It is therefore 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. Several schema systems exist to aid in the definition of XML-based languages, while programmers have developed many application programming interfaces (APIs) to aid the processing of XML data. Although the design of XML focuses on documents, the language is widely used for the representation of arbitrary data structures such as those used in web services. It is a textual data format with strong support via Unicode for different human languages. The design goals of XML emphasize simplicity, generality, and usability across the Internet. 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.

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