Extensible Markup Language. HTML is concerned with display of content; XML is a language that is concerned with creating, sharing and processing information.
XML document
A data object made up of virtual storage units called entities, which contain either parsed or unparsed data. Parsed data is made up of characters, some of which form the character data in the document, and some of which form markup. Markup encodes a description of the document’s storage layout and logical structure.
Glossary - Modular
Definitions for RosettaNet Modular PIPs (XML Schema)
An XML document that defines the allowable content of a class of XML documents. A class of documents refers to all possible permutations of structure in documents that will still confirm to the rules of the Schema.
XSD
Refers to XML Schema Definition language
xsi
Refers to XML Schema instance namespace.This is a separate namespace for four schema-related attributes that may appear in instances. These attributes, whose names are commonly prefixed with xsi, are: type, nil, schemaLocation, and noNamespaceSchemaLocation.
