Some simple examples include:   Interpretation of truth values within networks must be treated more generally, because the truth value of a network may depend on several to many logic operators. Simple examples related to the two key logic operators, AND and OR, are:  relation, then the truth value of the operator is -1 (no support). As with data links, networks may also evaluate to partially true. Two conditions give rise to this condition in NetWeaver:   Barr, N.B., R.S. Copeland, M. De Meyer, D. Masiga, H.G. Kibogo, M.K. Billah, E. Osir, R.A. Wharton, and B.A. McPheron. 2006. Molecular diagnostics of economically important Ceratitis fruit fly species (Diptera: Tephritidae) in Africa using PCR and RFLP analyses. Bulletin of Entomological Research, 96: 505–521. online  Dai, J.J., S. Lorenzato and D. M. Rocke. 2004. A knowledge-based model of watershed assessment for sediment. Environmental Modelling & Software Volume 19: 423–433. online  Galbraith, John M., Ray B. Bryant, Robert J. Ahrens. 1998. An Expert System for Soil Taxonomy. Soil Science Volume 163: 748–758. online  Heaton, Jill S., Kenneth E. Nussear, Todd C. Esque, Richard D. Inman, Frank M. Davenport, Thomas E. Leuteritz, Philip A. Medica, Nathan W. Strout, Paul A. Burgess, and Lisa Benvenuti. 2008. Spatially explicit decision support for selecting translocation areas for Mojave desert tortoises. Biodiversity and Conservation 17:575–590. online  Hu, Z.B., X.Y. He, Y.H. Li, J.J. Zhu, Y. Mu, and Z.X. Guan. 2007. Ying yong sheng tai xue bao (The journal of applied ecology) 18:2841-5. online  Janssen, R., H. Goosen, M.L. Verhoeven, J.T.A. Verhoeven, A.Q.A. Omtzigt, and E. Maltby. 2005. Decision support for integrated wetland management, Environmental Modelling & Software Volume 20: 215–229. online  Mendoza, G.A., and Ravi Prabhu. 2004.