In order to specialize, you need to first create the target DTD and then add enough information to your content to allow it to be migrated.
要进行专门化，首先要创建目标DTD，然后在内容中增加足够的信息以便进行迁移。
If you need to allow more content structures than the base types allow, you can specialize directly from topic, or form your own base type.
如果您需要比基本类型允许还要多的内容结构，可以直接从topic专门化或形成您自己的基类型。
This means you need to know which firms specialize in what kind of work.
这意味着你必须知道哪些公司专门从事什么样的工作。
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