The calculatedlength of a structural member is a very important conception in structural design, because it was used to control the instability of the member.
杆件计算长度是结构设计中的一个重要概念，与该杆件的稳定性控制有密切关系。
2
The nodes have a wide range of options for applying and parsing sequences, including literal values, expressions calculated from an XPath predicate, and sequences bounded by a given length of time.
The other attributes are the start of the token (first_column) and the end (last_column), which are calculated by the start and the length of the token.