W3CHINA.ORG讨论区--一些SW的常见问题的design pattern

贴子主题：一些SW的常见问题的design pattern

本主题类别:

OWL DL 本体构建指南
摘自 OWL Pizzas: Common errors & common patterns from practical experience of teaching OWL-DL

1. Always paraphrase a description or definition before encoding it in OWL,
and record the paraphrase in the comment area of the interface.
在用本体表示以前，用自然语言描述清楚你想表达的意思
2. Make all primitives disjoint - which requires that primitives form trees
使得没有完全定义的类互为不交
3. Use someValuesFrom as the default qualifier in restrictions
allValuesFrom 并不蕴涵someValuesFrom, 缺省情况下使用someValuesFrom
如果用allValuesFrom ,或maxCarndinality定义类, 由于DL采用开放世界假设，使得无法判定
一个实例属于这个类。
4. Be careful to make defined classes defined – the default is primitive. The
classifier will place nothing under a primitive class (except in the presence
of axioms /domain/range constraints)
谨慎给出类的完全定义。
5. Remember the open world assumption. Insert closure restrictions if that is
what you mean.
注意描述逻辑中的开放世界假设，这与数据库不同，如果需要的化加入封闭世界公理。
6. Be careful with domain and range constraints. Check them carefully if classification
does not work as expected.
谨慎给出类的定义域和值域约束，他们是全局约束，可能会导致不期望的结果
7. Be careful about the use of “and” and “or”(intersectionOf, unionOf )
注意逻辑意义上的“and”和“or”和自然语言中的区别
8. To spot trivially satisfiable restrictions early, always have an existential
(someValuesFrom) restriction corresponding to every universal (allValuesFrom)
restriction, either in the class or one of its superclasses (unless you specifi-
cally intend the class to be trivially satisfiable).
如果想表达某个类的属性值必须都是属于一个类的，别忘了加上someValuesFrom限制.
参考：http://bbs.xml.org.cn/dispbbs.asp?boardID=2&ID=8036
9. Run the classifier frequently; spot errors early
频繁运行分类器，早点发现错误。

强烈推荐： http://www.cs.man.ac.uk/~horrocks/Teaching/cs646/
Lecture notes:
Ontology Building

Introduction (PPT)
Existentials and Universals (PPT)
Classes, Instances, Concepts & Individuals (PPT)
Definitions, Descriptions, Restrictions & Axioms (PPT)
Ontology Patterns & Top Ontologies (PPT)
Ontology Patterns Parts and Wholes (PPT)
Representing Time & Space (PPT)

[此贴子已经被作者于2004-7-1 23:05:36编辑过]


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