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.Д¬haracter An XML document is a string of characters. The material in this section is based on the XML Specification. Further 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.

RFC 7303 also recommends that XML-based languages be given media types ending in +xml for example image/svg+xml for SVG. It also defines the media types application/xml and text/xml, which say only that the data is in XML, and nothing about its semantics. IETF RFC:3023, now superseded by RFC:7303, gave rules for the construction of Internet Media Types for use when sending XML. XML has come into common use for the interchange of data over the Internet. This is also referred to as the canonical schema. The message exchange format is standardised as an XML schema (XSD). Disparate systems communicate with each other by exchanging XML messages. XML is widely used in a Service-oriented architecture (SOA). XML is used extensively to underpin various publishing formats. In publishing, Darwin Information Typing Architecture is an XML industry data standard. Many of these standards are quite complex and it is not uncommon for a specification to comprise several thousand pages. 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. NET Framework use XML files for configuration, and property lists are an implementation of configuration storage built on XML. XML has also provided the base language for communication protocols such as XMPP. XML-based formats have become the default for many office-productivity tools, including Microsoft Office ( Office Open XML), and LibreOffice ( OpenDocument), and Apple's iWork.

Hundreds of document formats using XML syntax have been developed, including RSS, Atom, SOAP, SVG, and XHTML. The essence of why extensible markup languages are necessary is explained at Markup language (for example, see Markup language В§ XML) and at Standard Generalized Markup Language.

8.2.3 Valid Unicode characters in XML 1.0 and XML 1.1.

4 Syntactical correctness and error-handling.

Conversione file txt xml format