BuildingBackLinks
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="generator" content=
"HTML Tidy for Mac OS X (vers 31 October 2006 - Apple Inc. build 13), see www.w3.org" />
<title>
BuildingBackLinks -- /DesignIssues
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<nextid />
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<body bgcolor="#FFC060" text="#302005">
<a href="OldDocs.html"><img src=
"../Icons/WWW/arch1990.gif" /></a>
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<h1>
Building back-links
</h1>
<h2>
Why back links?
</h2>This <a name="1" href="Topology.html#14">discussion on
link topology</a> differetiates between systems with
mon-directional and those with bidirection links. In practice,
a system
<p>
in which different parts of the web have different
capabilities cannot insist on bidirectional links.
</p>
<p>
Imagine, for example the publisher of a large and famous book
to which many people refer but who has no interest in
maintaining his end of their links or indeed in knowing who
has refered to the book. In this case the link may be only of
use to the person who made it.
</p>
<p>
However, there are cases in which the back-links are of great
interest, and so they may be generated off line.
</p>
<h2>
How?
</h2>One way is for a <a name="2" href=
"../Terms.html#daemon">daemon</a> to read all of the documenst
on a particular domain, and make a database of the links, then
redistribute to the servers the back links.
<p>
Another way is suggested by Phillip Hallam-Baker who
"wondered about a tag being added to the get protocol to
indicate where the text was being accessed from. This could
then be used by intelligent servers to create back links - if
this was desired. This would allow the wed to grow dynamicaly
since I would know that logging onto any "key" W3 server I
would be able to travel to all those parts of the web I was
meant to..."
</p>
<p>
This method would also provide intersting statistics on the
use of particular links, which would enhance the usage
logging.
</p>
<p>
_________________________________________________________________
</p>
<address>
<a name="0" href=
"http://www.w3.org./hypertext/TBL_Disclaimer.html">Tim BL</a>
</address>
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