订阅和发布系统：在某些情况下，一个系统可以同时向分类法建模系统进行订阅和发布。
Subscribing and publishing systems: in some cases, a system can both subscribe and publish to the taxonomy modeling system.
本文通过分析常用的平文本分类方法在直接应用到富文本文档时表现较差的原因，提出了富文本分类建模时应该考虑的因素，并将其归纳为七个方面。
The thesis, by analyzing the reasons, proposes the factors that should be taken in account in stage of rich format text classification modeling, and then groups them into seven aspects.
介绍了在经济领域中进行数学建模的数学经济重要性，并对数学经济建模的分类、方法、步骤及其应用作了一些有益的探讨。
The article introduces what the mathematical economic modeling is and it's importance. It also provides some helpful inquiry on it's classification, method, procedure and application.
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