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MIKEDLR / Link_Controller-0.037 / docs / HTML / link-controller_16.html 
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<H1> H. Terms </H1>
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<P>

<BLOCKQUOTE><TABLE BORDER=0 CELLSPACING=0> 
<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="link-controller_16.html#SEC53">H.1 Infostructure</A></TD><TD>&nbsp;&nbsp;</TD><TD ALIGN="left" VALIGN="TOP">Groups of resources.</TD></TR>
<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="link-controller_16.html#SEC54">H.2 Link</A></TD><TD>&nbsp;&nbsp;</TD><TD ALIGN="left" VALIGN="TOP">A connection between two resources.</TD></TR>
<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="link-controller_16.html#SEC55">H.3 Resource</A></TD><TD>&nbsp;&nbsp;</TD><TD ALIGN="left" VALIGN="TOP">The information on the World Wide Web.</TD></TR>
<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="link-controller_16.html#SEC56">H.4 URIs</A></TD><TD>&nbsp;&nbsp;</TD><TD ALIGN="left" VALIGN="TOP">A type of link including URLs</TD></TR>
<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="link-controller_16.html#SEC57">H.5 URLs</A></TD><TD>&nbsp;&nbsp;</TD><TD ALIGN="left" VALIGN="TOP">The connections in the World Wide Web.</TD></TR>
<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="link-controller_16.html#SEC58">H.6 URIs</A></TD><TD>&nbsp;&nbsp;</TD><TD ALIGN="left" VALIGN="TOP">Names for resources without location.</TD></TR>
</TABLE></BLOCKQUOTE>
<P>

<A NAME="Infostructure"></A>
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<H2> H.1 Infostructure </H2>
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<P>

An infostructure is a concept which was introduced in Link Checking in
the MOMspider package.  It is a collection of related resources.  For us
it's mostly just a way of saying `web pages' but includes things like
databases which may not have any real identifiable `pages' that we can
read through directly.
</P><P>

<A NAME="Link"></A>
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</TR></TABLE>
<H2> H.2 Link </H2>
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<P>

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:
</P><P>

<A NAME="Resource"></A>
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<H2> H.3 Resource </H2>
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<P>

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 <A HREF="link-controller_16.html#SEC57">H.5 URLs</A>, for more
details.
</P><P>

<A NAME="URIs"></A>
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</TR></TABLE>
<H2> H.4 URIs </H2>
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<P>

A URI or `Uniform Resource Identifier' is a more generic form of the URL
<A HREF="link-controller_16.html#SEC57">H.5 URLs</A> which also includes URNs <A HREF="link-controller_16.html#SEC58">H.6 URIs</A>.  It also allows links to
abstract objects which can't be reached through a network server.  Since
all URLs are URIs we mostly try to talk about URIs when we can since
that includes both.  Often people say URL when they mean URI.  We try to
use correct usage always so that in future we can support all forms of
URI without confusing existing users.  URIs and URLs are defined in RFC
2396.
</P><P>

<A NAME="URLs"></A>
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</TR></TABLE>
<H2> H.5 URLs </H2>
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<P>

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.  URLs and URIs are defined in RFC 2396.  URLs are not the
only kind of link, but they are the most common and currently the only
ones LinkController really handles well.
</P><P>

<A NAME="URNs"></A>
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</TR></TABLE>
<H2> H.6 URIs </H2>
<!--docid::SEC58::-->
<P>

A URN or `Uniform Resource Name' is a URI <A HREF="link-controller_16.html#SEC56">H.4 URIs</A> which is not a URL
<A HREF="link-controller_16.html#SEC57">H.5 URLs</A>.  This means a way of specifying a resource without saying
how to get it.  For example, a scheme which has been considered is for
ISBN (International Standardised Book Numbers) numbers.  This would
allow us to specify a book as a resource but wouldn't tell us how to get
it.
</P><P>

It's not totally clear where these will be useful in link checking (they
are used internally in several computer systems), but LinkController
intends to support them whenever needed, wherever possible.
</P><P>

<UL>
<LI>
Knowing what the URL of the target resource of the connection is.
<LI>
Knowing whether the connection to the target resource has been working
recently.
<LI>
Knowing when the connection to the target resource was last checked.
</UL>
<P>

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.
</P><P>

<A NAME="Names Index"></A>
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