At this point in time libraries need to be careful about becoming too dependent upon the
world wide web resources. Web resources often change location, and until location
independent naming schemes replaces URLS, updating a library’s link to external
resources is likely to be a serious problem. Few information providers have the kind of
commitment to long term information maintenance that libraries have; libraries need to
be concerned that the creators of the key resources they link to day may soon tire of up
out dated resources. Finally, libraries need to avoid relying too heavily upon external
information resources, which are free to day but may become expensive some time in
future; some information providers have learned the same information providers have
learned the same business principles as drug dealers giving out free services until the user
is hooked to the business.