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¿Cuales son las definiciones más corrientes para los siguientes conceptos?
Documenta tus definiciones con los correspondientes URL's.

1) hypertext:
Hypertext is the presentation of information as a linked network of nodes which readers are free to navigate in a non-linear fashion. It allows for multiple authors, a blurring of the author and reader functions, extended works with diffuse boundaries, and multiple reading paths.
It is a term coined by Ted Nelson around 1965 for a collection of documents (or "nodes") containing cross-references or "links" which, with the aid of an interactive browser program, allow the reader to move easily from one document to another.
http://www.iath.virginia.edu/elab/hfl0037.html
Roland Barthes describes an ideal textuality that precisely matches that which has come to be called computer hypertext -- text composed of blocks of words (or images) linked electronically by multiple paths: "the networks [réseaux ] are many and interact, without any one of them being able to surpass the rest; this text is a galaxy of signifiers, not a structure of signifieds; it has no beginning; it is reversible; we gain access to it by several entrances, none of which can be authoritatively declared to be the main one..."
http://www.cyberartsweb.org/cpace/ht/jhup/history.html

2) link:
The link is on a Web page the blue, often underlined text, that makes the cursor from your mouse change shapeIf you click on a link it will take you to another page or another site. You find information on the Internet by clicking through to links you are interested in.
There are three main types of links that you may be interested in using when designing your Web page: links that take you to another place on the same page (as in an index), links that take you to another site and links that go to another page on your site. The codes for all three are done differently.
http://personalweb.about.com/cs/glossary/g/link.htm

3) lexia:
The lexia is a block of hypertext which is connected to other lexiae through links, which comment upon each other (some might say, dialogue with each other). Roland Barthes’ definition ( S/Z ) provides us with an understanding that this is the basic building block of the hypertextual universe: It is the atom, the letter, the point of hypertext. It is viewed nonsequentially from the perspective of the author, sequentially from the perspective of the reader, and is the embodiment of the poststructuralist ideal: brief interconnected segments whose context is provided by the lexiae that surround it in three dimensions.
http://www.magnesium.net/~gregsamsa/lexiacon/ archives/000001.html

4) node:
A node is any device connected to a computer network. Nodes can be computers, personal digital assistants (PDAs), cell phones, or various other network appliances. On an IP network, a node is any device with an IP address, which is probably the world's single most popular network protocol and supports the notion of unique addressing for computers on a network. It is also known as device.
http://www.phoenix5.org/glossary/node.html
A network node is a grouping of one or more network elements (at one or more sites) which provides network related functions, and is administered as a single entity. A single site may contain more than one network node.
http://www.atis.org/tg2k/_network_node.html

5) interactivity:
Interactivity has to do with the interchange of action and response. An interactive site would be one in which some action of the user generates a response either from another human being at the other end of the connection or with a program residing on a computer. In terms of the Internet activity of web sites, there seem to be several levels or kinds of interactivity.
At the one end would be the order-form type of page which allows the user to request some service or merchandise from a distributor and have that item sent to a given address. At the opposite end of the scale are those sites that encourage ongoing interaction between the people involved--bulletin boards, forums, chat, newsgroups, etc.
http://netsim.kib.ki.se/interactivity.cfm


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