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All files with an " Sps " extension are programming / syntax files written in a statistical package language , " Statistical Package for the Social Sciences " ( SPSS ) . See [ KT1 ] for a discussion about the advantages and limitations of various definition languages . HLL abstracts away the state-space view of the internal representation language so that the knowledge engineer does not have to deal with states and state transitions but with actions , their sequence , and their preconditions . The IMS Question & Test Interoperability Specification provides proposed standard XML language for describing questions and tests . The proposed technique is evaluated with synthetic videos where ground-truth is known , and with American Sign Language videos where the goal is to detect periodic hand motions .