The Need for X.500 Index DSAs

This is a discussion paper on Index DSAs, which are advanced as part of a more service-oriented approach to using X.500. The paper argues that Index DSAs are needed to provide key services which cannot be provided by simply using the existing X.500 infrastructure. Some of the problems with the use of strict X.500 techniques are then discussed. An alternative approach is proposed using X.500 servers partially connected to the main DIT. These servers hold information in the most natural place in the DIT, but deliberately provide a particular view of the DIT. This might be a restricted view of information in the main DIT, or even a view which is enhanced by a service provider adding more information themselves.