Already exists, and is a PRIMARY or CANDIDATE indextag.
已经存在，并且是主索引标记或候选索引标识。
2
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。
3
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.