The itemNumber column provides a unique identity for each item (or row) and has an attachedcolumn-level constraint that enforces a valid value to always be supplied (NOT NULL).
In this paper, the fundamental flexure characteristics of the attachedcolumn are discussed first to demonstrate a practical analytical model for the column with multiple attaching points.
本文首先讨论附着式塔身的基本弯曲特性，以论证多点附着式塔身的实用分析模型。
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This column described a simple way to gain back that ability without losing any of the new features by using a URI attached to the URL.