For the truth value of this ContextLink and others in this file, based on the example on page 154 of Real World Reasoning, and the syntax described on page 23 of Probabilistic Logic Networks, the "<.9>" value in the example is the strength value. So, to be consistent with the example as written, the truth value set here should have a .9 strength, plus some reasonably high confidence value. As currently written, it has a .5 strength.