上下文位置总是小于或等于上下文大小。
The context position is always less than or equal to the context size.
这个上下文可以存储的数据大小的限制是 512 字节。
There is a 512 bytes limit on the size of data this context can hold.
顺便说一下，DCMI词汇表术语是大小写不敏感的，因为常常被用于大小写不敏感的上下文，如HTML(即XHTML的前身)。
Incidentally, notice that DCMI vocabulary terms are not case-sensitive, since they will often be used in case-insensitive contexts such as HTML (pre-XHTML, that is).
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