A piece of network software or hardware that analyses the Internet traffic passing through it, and which rejects or blocks any traffic containing unapproved words, phrases or URLs.
A digitised copy of a document, book, manuscript or other artifact. Many digital editions are made available for public use, to allow easy access to rare or fragile resources.
XML is the successor to SGML, and is the metalanguage of most of the latest generation of markup languages, such as XHTML, DocBook, TEI, etc. It is much stricter than SGML with its syntax, which makes it much easier for computers to read documents created with it.
“Free/Libre Open Source Software”, or just “Open Source Software” describes a type of software written by individuals or a community that is released for free use and adaptation into the community at large. The 'free' here is more akin to freedom of expression (hence the qualification, 'Libre'), rather than referring necessarily to a lack of financial recompense, though much of FLOSS is distributed free-of-charge too.
A simple method of restricting access to the Internet, sometimes used by schools, where web pages or sites of interest are copied to a local web server on the school's intranet (local network).
A language to describe other languages. SGML is the metalanguage that is used to define HTML. Terms such as verb, noun, adjective are all metalanguage terms used to describe English and other human languages.
Standard Generalized Markup Language
A method of allowing restricted access to the Internet, often used in schools. The connection to the Internet backbone permits access only to known “safe” or approved sites, by blocking Internet traffic to all other sites.
A more modern version of HTML written using XML.