LBAC通过为表对象添加安全标签来控制对它的访问。
LBAC controls access to table objects by attaching security labels to them. Users attempting to access an object must have its security label granted to them.
XML文档中存储的信息可能需要放在一个关系表对象中。
Information stored in an XML document may need to be placed in a relational table object.
获取工作表对象后，遍历工作表并处理它的数据。
After obtaining the sheet object, move across the sheet and work with its data.
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