EXist
Encyclopedia
Open source
The term open source describes practices in production and development that promote access to the end product's source materials. Some consider open source a philosophy, others consider it a pragmatic methodology...
database management system
Database management system
A database management system is a software package with computer programs that control the creation, maintenance, and use of a database. It allows organizations to conveniently develop databases for various applications by database administrators and other specialists. A database is an integrated...
entirely built on XML
XML
Extensible Markup Language is a set of rules for encoding documents in machine-readable form. It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications, all gratis open standards....
technology, also called a native XML database. Unlike most relational database management systems, eXist uses XQuery
XQuery
- Features :XQuery provides the means to extract and manipulate data from XML documents or any data source that can be viewed as XML, such as relational databases or office documents....
, which is a W3C Recommendation, to manipulate its data.
eXist Benefits
eXist allows software developers to persist XML data without writing extensive middleware. eXist follows and extends many W3CWorld Wide Web Consortium
The World Wide Web Consortium is the main international standards organization for the World Wide Web .Founded and headed by Tim Berners-Lee, the consortium is made up of member organizations which maintain full-time staff for the purpose of working together in the development of standards for the...
XML standards such as XQuery
XQuery
- Features :XQuery provides the means to extract and manipulate data from XML documents or any data source that can be viewed as XML, such as relational databases or office documents....
. eXist also supports REST
Representational State Transfer
Representational state transfer is a style of software architecture for distributed hypermedia systems such as the World Wide Web. The term representational state transfer was introduced and defined in 2000 by Roy Fielding in his doctoral dissertation...
interfaces for interfacing with AJAX
Ajax (programming)
Ajax is a group of interrelated web development methods used on the client-side to create asynchronous web applications...
-type web forms. Applications such as XForms
XForms
XForms is an XML format for the specification of a data processing model for XML data and user interface for the XML data, such as web forms...
may save their data by using just a few lines of code. The WebDAV interface to eXist allows users to "drag and drop" XML files directly into the eXist database. Because eXist automatically indexes documents using a keyword indexing system it is very easy to create high-performance document search systems with eXist.
eXist Standards and Technologies
eXist has support for the following standards and technologies- XPathXPathXPath is a language for selecting nodes from an XML document. In addition, XPath may be used to compute values from the content of an XML document...
- XML Path language - XQueryXQuery- Features :XQuery provides the means to extract and manipulate data from XML documents or any data source that can be viewed as XML, such as relational databases or office documents....
- XML Query language - WebDAVWebDAVWeb-based Distributed Authoring and Versioning is a set of methods based on the Hypertext Transfer Protocol that facilitates collaboration between users in editing and managing documents and files stored on World Wide Web servers...
- Web distributed authoring and versioning - RESTRepresentational State TransferRepresentational state transfer is a style of software architecture for distributed hypermedia systems such as the World Wide Web. The term representational state transfer was introduced and defined in 2000 by Roy Fielding in his doctoral dissertation...
- Representational state transfer (URL encoding) - SOAPSOAPSOAP, originally defined as Simple Object Access Protocol, is a protocol specification for exchanging structured information in the implementation of Web Services in computer networks...
- Simple Object Access Protocol - XACMLXACMLXACML stands for eXtensible Access Control Markup Language. The standard defines a declarative access control policy language implemented in XML and a processing model describing how to evaluate authorization requests according to the rules defined in policies.As a published standard...
- XML Access Control Language - XIncludeXIncludeXInclude is a generic mechanism for merging XML documents, by writing inclusion tags in the "main" document to automatically include other documents or parts thereof. The resulting document becomes a single composite XML Information Set...
- server-side include file processing (limited support) - XML-RPCXML-RPCXML-RPC is a remote procedure call protocol which uses XML to encode its calls and HTTP as a transport mechanism. "XML-RPC" also refers generically to the use of XML for remote procedure call, independently of the specific protocol...
- a remote procedure call protocol - XProcXProcXProc is a W3C Recommendation to define an XML transformation language to define XML Pipelines.Below is an example abbreviated XProc file: This is a pipeline that consists of two atomic steps, XInclude and Validate...
- a XML Pipeline processing language - XQiB - XQuery in browser http://xqib.org
- XQuery API for JavaXQuery API for JavaXQuery API for Java refers to the common Java API for the W3C XQuery 1.0 specification. It was submitted under the Java Community Process as JSR 225 , and final release was made available on June 24, 2009.The XQJ API enables a Java developer to:...
eXist History
eXist was created in 2000 by Wolfgang Meier who still is the lead developer as of 2010. In September 2006, it reached version 1.0 and 1.1 (new numbering scheme). Current maintenance activities are on the 1.4.x versions and new developments are on the 1.5dev version that will be released as 1.6.0.eXist was nominated in 2006 as the best XML database of the year by InfoWorld
InfoWorld
InfoWorld is an information technology online media and events business operating under the umbrella of InfoWorld Media Group, a division of IDG...
.
eXist is used heavily in the XRX
XRX (web application architecture)
In software development XRX is a web application architecture based on XForms, REST and XQuery. XRX applications store data on both the web client and on the web server in XML format and do not require a translation between data formats...
web application architecture.
See also
- XML databaseXML databaseAn XML database is a data persistence software system that allows data to be stored in XML format. This data can then be queried, exported and serialized into the desired format.Two major classes of XML database exist:...
- XQueryXQuery- Features :XQuery provides the means to extract and manipulate data from XML documents or any data source that can be viewed as XML, such as relational databases or office documents....
- w3c XML query language - XPathXPathXPath is a language for selecting nodes from an XML document. In addition, XPath may be used to compute values from the content of an XML document...
- w3c XML data selection language - WebDAVWebDAVWeb-based Distributed Authoring and Versioning is a set of methods based on the Hypertext Transfer Protocol that facilitates collaboration between users in editing and managing documents and files stored on World Wide Web servers...
- Web Distributed Authoring and Versioning - SOAPSOAPSOAP, originally defined as Simple Object Access Protocol, is a protocol specification for exchanging structured information in the implementation of Web Services in computer networks...
- Simple Object Access Protocol - CouchDBCouchDBApache CouchDB, commonly referred to as CouchDB, is an open source document-oriented database written mostly in the Erlang programming language. It is part of the NoSQL group of data stores and is designed for local replication and to scale horizontally across a wide range of devices...
- a document-oriented database based on JSON