熟悉WSDL的相关知识也将有所帮助，但本教程中会对一般概念进行回顾。
Knowledge of WSDL is also helpful, but the tutorial does review the general concepts.
但概念是具体的，概念自身，甚至每一个规定性，本质上一般都是许多不同规定的统一体。
Now as the notion is concrete, it and every character of it in general is essentially a self-contained unity of distinct characteristics.
一般来说，实在论的含义比较模糊，但实在能通过真理、可检验性等概念在语义学中得到严格的规定。
Reality can be defined in semantics by the conception of truth, testability etc, though the meaning of realism is vague.
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