它是eXo platoform的一部分，包含规范要求的所有强制特性和几个可选特性。
Is part of the eXo platoform and contains all the mandatory features required by the specification and several optional ones.
一些本身被列为机密，又或受不同形式的法律保护而须保密的资料，便需借助相互法律协助程序的强制特性才可取得。
Information that is confidential in nature or is subject to any form of legal protection requires the compulsive nature of the mutual legal assistance process to gain access to it.
通过按范围对连续变量值进行编组，然后将它们进一步细分来创建分层结构，可以将这些变量强制转换为分类特性形式。
Continuous variables can also be cast into the appearance of taxonomic features by organizing their value into ranges, which can then be further subdivided to create a hierarchy.
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