the criteria of ecosystem quality include qualitative diagnostic and grade-assessment ones. the qualitative diagnosis is a fact judgment ( yes or not), while the grade-assessment is a value judgment.
value judgment as well as fact judgment follows the logic rule, so the logical reasoning of 「mixed」 syllogism is possible. if the conclusion is value judgment, the premise must have a value judgment.
the fundamental reasons lie in the confusing about realism theory and value theory, fact judgment and value judgment by 「two factor theory」.
其根本原因在于「两因素」说把实在论和价值论、事实判断和价值判断混淆起来。
after the fact judgment and value judgment, on the basis of pure endowment insurance, i answer the question that how the land readjustment in rural area to exist in legal norm.