To convert an existing column into a primary key, click on the column (property in the class) in the diagram.

要转换一个已有的列成为一个主键，在图中点击这个列(类中的属性)。

For example, the "How" column has a strong process emphasis and can be compared with the UML Activity diagram.

例如，“如何实现”这一列重点强调处理过程，并可以与UML活动图相比较。

There are certain properties which can be modified from the diagram — for instance, adding a new column in a table and so on.

某些属性可以从图中进行修改——例如，在一个表中增加一个新列，等等。

Diagram illustrates a typical two-column layout marked up using divs with id and class attributes.

图表说明一个典型的用div元素带上id和class属性标记的2栏布局。

This will make to move in the engineering diagram or change a headline column size easy.

这将使在工程图中移动或改变题栏大小容易。