7IMS GLOBAL LEARNING CONSORTIUM.IMS abstract framework:white paper versionl[EB/OL].http://www.ims global.org/af/afv1p0/imsafwhitepapervl p0.html.
8IEEE LTSC-WGI(IEEE P1484.1).Draft standard for learning technology-learning technology systems architecture (LTSA)[EB/OL].(2001-11-30)[2006-10-10].http://www.weblearning.org/ osservatorio/ Standard/Standard.LTSA.031204/view.
9RICHARDSON T.An introduction to bayesian networks[J].Journal of the American Statistical Association,1997,92:23-35.
10HUANG C,DARWICHE A.iInference in belief networks:a procedural guide[J].International Journal of Approximate Reasoning,1994,11:1-158.