  Semantic Web is an open, distributed, and dynamic environment where access to
resources cannot be controlled in a safe manner unless the access decision
takes into account during discovery of web services. Security becomes the
crucial factor for the adoption of the semantic based web services. An access
control means that the users must fulfill certain conditions in order to gain
access over web services. Access control is important in both perspectives i.e.
legal and security point of view. This paper discusses important requirements
for effective access control in semantic web services which have been extracted
from the literature surveyed. I have also discussed open research issues in
this context, focusing on access control policies and models in this paper.
