System identifier

See also: Oracle Database and SID

A system identifier is a document-processing construct introduced in the HyTime markup language as a supplement to SGML. It was subsequently incorporated[by whom?] into the HTML and XML markup languages.

In HyTime, there are two kinds of system identifier: formal system identifier (FSI) and simple system identifier.

In HTML and XML, a system identifier is a fragmentless URI reference. It typically occurs in a Document Type Declaration. In this context, it is intended[by whom?] to identify a document type which is used exclusively in one application, whereas a public identifier identifies a document type that may span more than one application.

In the following example, the system identifier is the text contained within quotes:

`<!DOCTYPE html SYSTEM "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">`

## External links

* Description of the system identifier in the context of the Extensible Markup Language (XML) 1.0 (Fifth Edition) on W3.org

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