Already exists, and is a PRIMARY or CANDIDATE index tag.
已经存在，并且是主索引标记或候选索引标识。
This list of tags — generated on an AD hoc basis during the actual document parsing — was used as an index for single-byte tag placeholders used in a structure schematic.
该标记列表—在实际的文档解析期间在特别基础上生成—用作结构示意图中使用的单字节标记占位符的索引。
An index entry is created for each complete tag context for each data element — that is, the concatenation of every tag leading up to the data element.
为每个数据元素的所有完整标记上下文创建索引项—即，并置数据元素前的每个标记。
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