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...mple, if any property of a LO whose subject is the same as one of user 128’s goal topics is updated, then the following rule adds a new arc linking user 128’s updated_LOs collection to the modified LO: ON UPDATE (resource()AS INSTANCE OF LearningObject,_,_->_) IF $delta/target(rdf:type) = resource(http://www.dcs.bbk.ac.uk/users/128) /target(ims-lip:goal) /target(ims-lip:goaldescription) /target(selene:goaltopic) DO LET $updated_los := resource(http://www.dcs.bbk.ac.uk/users/128) /target(selene:messages) /target(selene:updated_LOs) IN INSERT ($updated_los,seq++,$delta);; We refer the reader to [20,22] for an overview of related work in ECA rule languages, the syntax and semantics of RDFTL, conservative tests for determining the termination and confluence of sets of RDFTL rules, and architecture, implementation and performance details. 6. Concluding Remarks This chapter has described several techniques for providing personalisation services in self e-learning networks. Our use of RDF/S for representing the descriptions of educational material and users within a SeLeNe has allowed us to reuse and extend as necessary a number of existing metadata standards for learning objects and learners. I...