This is a list of notable XML schemas in use on the Internet sorted by purpose. XML schemas can be used to create XML documents for a wide range of purposes such as syndication, general exchange, and storage of data in a standard format.
BeerXML - a free XML based data description standard for the exchange of brewing data
Business
ACORD data standards - Insurance Industry XML schemas specifications by Association for Cooperative Operations Research and Development
Europass XML - XML vocabulary describing the information contained in a Curriculum Vitae (CV), Language Passport (LP) and European Skills Passport (ESP)
OSCRE - Open Standards Consortium for Real Estate format for data exchange within the real estate industry
UBL - Defining a common XML library of business documents (purchase orders, invoices, etc.) by Oasis
EML - Election Markup Language, is an OASIS standard to support end-to-end management of election processes. It defines over thirty schemas, for example EML 510 for vote count reporting and EML 310 for voter registration.
Engineering
gbXML - an open schema developed to facilitate transfer of building data stored in Building Information Models (BIMs) to engineering analysis tools.
IFC-XML - Building Information Models for architecture, engineering, construction, and operations.
XMI - an Object Management Group (OMG) standard for exchanging metadata information, commonly used for exchange of UML information
XTCE - XML Telemetric and Command Exchange is an XML based data exchange format for spacecraft telemetry and command meta-data
Financial
FIXatdl - FIX algorithmic trading definition language. Schema provides a HCI between a human trader, the order entry screen(s), unlimited different algorithmic trading types (called strategies) from a variety of sources, and formats a new order message on the FIX wire.
FIXML - Financial Information eXchange (FIX) protocol is an electronic communications protocol initiated in 1992 for international real-time exchange of information related to the securities transactions and markets.
FpML - Financial products Markup Language is the industry-standard protocol for complex financial products. It is based on XML (eXtensible Markup Language), the standard meta-language for describing data shared between applications.
Geographic information systems and geotagging
KML - Keyhole Markup Language is used for annotation on geographical browsers including Google Earth and NASA's World Wind. These annotations are used to place events such as earthquake warnings, historical events, etc.
SensorML - used for describing sensors and measurement processes
EAD - for encoding archival finding aids, maintained by the Technical Subcommittee for Encoded Archival Description of the Society of American Archivists, in partnership with the Library of Congress
MARCXML - a direct mapping of the MARC standard to XML syntax
METS - a schema for aggregating in a single XML file descriptive, administrative, and structural metadata about a digital object
MODS - a schema for a bibliographic element set and maintained by the Network Development and MARC Standards Office of the Library of Congress
ONIX for Books - ONline Information eXchange, developed and maintained by EDItEUR jointly with Book Industry Communication (UK) and the Book Industry Study Group (US), and with user groups in Australia, Canada, France, Germany, Italy, the Netherlands, Norway, Spain and the Republic of Korea.
PRISM - Publishing Requirements for Industry Standard Metadata