Papers in PDF format

say on a LAN with a hypermedia server, authors can create links to ``chunks" of information as suggested by Figure 2.
The customised document can then be made available to selected groups of users by setting appropriate link and
document access rights.
Figure 2: Customisation of Documents
Almost certainly users will access the information on a first come first served basis as in traditional libraries. It will be
the information manager's responsibility to see that users are not locked out by insufficient copies - the greater the
demand the more copies the provider must supply and pay for.
An important consideration is how we should control the process of users adding source anchors to library documents. It
may be necessary, for example, that authors give permission for information providers to set up the link-access rights so
that groups of authorised users can add links to write-protected documents. We realise, however, that to protect systems
from being overloaded considerably more research needs to be done to determine just how the user rights need to be
managed.
Sequencing
As a final example of the significant advantages of having a separate link engine, consider the process of maintaining
sequential lists of URLs in most WWW systems. For example, consider the steps that must be taken if a new Document
named Maurer has to be inserted into a list already containing Lanier and Nelson (see Figure 3).