A close examination of most DTDs, however, reveals a fair degree of flexibility-particularly if the DTD is from a generic source or derived from a standard or specification.

然而，对大多数DTD的密切观察就会发现相当程度的灵活性—特别是当这个DTD源于普通资源或者来自一个标准或规范时。

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Using standard message flow manipulation logic, the value at the tree location could be defined statically, computed from message content, or even derived from an external source.

使用标准消息流操作逻辑，该树位置处的值可以静态地定义、根据消息内容计算得出，或者从外部来源得出。

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The numbers indicate the ratios; the colors indicate where the ratios fit into the industry-standard ranges (derived from numerous open source projects).

数字表示比值；颜色表示比值是否在行业标准范围内（行业标准范围来自大量开放源码项目）。

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This standard, originally derived from horse-drawn wagons in British mines, has remained even as railway engineering has undergone 150 years of change.

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Standard Chartered is based in London, but most of its business is derived from the Asian market.

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