Using LinkController: Terms

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# C. Terms

> C.1 Resource |  | The information on the World Wide Web.
> C.2 URLs |  | The connections in the World Wide Web.
> C.3 Infostructure |  | Groups of resources.
> C.4 Link |  | A connection between two resources.

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## C.1 Resource

A resource is almost anything. `It' can range from a person to an HTML file to a computer to a database or presumably eventually to phone numbers, possibly physical hardware. This generality is a very important concept for the World Wide Web. Really the key thing about a resource is that it can be `identified'. See section C.2 URLs, for more details.

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## C.2 URLs

A URL or `Uniform Resource Locator' are the essence of the World Wide Web. Approximately, they are addresses through which `resources' can be located. The idea is that almost anything can be given some kind of address in a form that a machine can work with. By defining a set of rules, this can then be converted into a URL. A URL has two parts. The first tells us what rules to use and the second tells us what the address is.

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## C.3 Infostructure

An infostructure is a concept which was introduced in Link Checking in the MOMspider package. It is a collection of related resources.

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## C.4 Link

The term link in LinkController is used for a connection between two resources. It's existence really comes from the `class' or piece of type of computer data which is used to store information about `links'. Properties of a link include:

- Knowing what the URL of the target resource of the connection is.
- Knowing whether the connection to the target resource has been working recently.
- Knowing when the connection to the target resource was last checked.

Within the programs, a link is different from a URL in that it is specifically aimed at checking connections, where a URL just specifies what the connection should be if it is working.

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This document was generated by Michael De La Rue on January, 6 2002 using texi2html