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epresents the set of all possible Uniform Resource Locators all over the <strong>in</strong>ternet but for now only the HTTP<br />

addresses are relevant which leads to the def<strong>in</strong>ition of the subset:<br />

Po<strong>in</strong>ter: P URL<br />

which conta<strong>in</strong>s only the selected range of addresses. It is possible to describe the World Wide Web as:<br />

DataInfrastructure<br />

node: Po<strong>in</strong>ter © Content<br />

title: Po<strong>in</strong>ter © S<br />

l<strong>in</strong>ks: Po<strong>in</strong>ter © P Po<strong>in</strong>ter<br />

–<br />

dom node = dom title<br />

dom l<strong>in</strong>ks = dom node<br />

where node relates each valid URL with its contents, title maps each valid URL with its title and l<strong>in</strong>ks each<br />

node with a set of nodes.<br />

The <strong>in</strong><strong>format</strong>ion layer is a shared node and l<strong>in</strong>k database created co-operatively by a group of users with similar<br />

<strong>in</strong>terests. While they navigate the World Wide Web, the system records every step taken <strong>in</strong>to a common local<br />

database. There are several problems <strong>in</strong> this related with consistency ma<strong>in</strong>tenance, co-operative brows<strong>in</strong>g,<br />

ownership and privacy.<br />

KnownPo<strong>in</strong>ter: P URL<br />

–<br />

KnownPo<strong>in</strong>ter z Po<strong>in</strong>ter<br />

MappedDataInfrastructure<br />

knownNode: KnownPo<strong>in</strong>ter © Po<strong>in</strong>ter<br />

knownTitle: KnownPo<strong>in</strong>ter © S<br />

knownL<strong>in</strong>ks: KnownPo<strong>in</strong>ter © P Po<strong>in</strong>ter<br />

–<br />

dom knownNode = dom knownTitle<br />

dom knownL<strong>in</strong>ks = dom knownNode<br />

In<strong>format</strong>ionLayer<br />

knownNode: Po<strong>in</strong>ter © Content<br />

knownTitle: Po<strong>in</strong>ter © S<br />

knownL<strong>in</strong>ks: Po<strong>in</strong>ter © P Po<strong>in</strong>ter<br />

–<br />

dom node = dom title<br />

dom l<strong>in</strong>ks = dom node<br />

F<strong>in</strong>al remarks<br />

The next step on this project is to specify and implement Level 2. Besides the possibility of help<strong>in</strong>g groups of<br />

users navigate <strong>in</strong> large <strong>in</strong><strong>format</strong>ion spaces through the shar<strong>in</strong>g of <strong>in</strong>dividual experiences, CAIN also addresses<br />

issues of adaptive <strong>in</strong>teraction. We hope to let the helper agents <strong>in</strong>side CAIN evolve so as to adapt to a user<br />

profile. Agents can follow each others user preferences when engag<strong>in</strong>g <strong>in</strong> exchange of <strong>in</strong><strong>format</strong>ion. In<strong>format</strong>ion<br />

navigation is thus seen as a process of collaborative <strong>in</strong>teraction.<br />

References<br />

[Beaumont 1995] Beaumont, I., Brusilovsky, P. (1995). Adaptive educational hypermedia: from ideas to real<br />

systems, H. Maurers, Eds., ED-MEDIA '95, Association for the advancement of comput<strong>in</strong>g education, Graz,<br />

Austria. 93-98.

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