Dxfer_direction: Used for data transfer direction; could be one of the following values.
dxfer_direction：用于确定数据传输的方向；常常使用以下值之一。
These values must match for a property transfer between two portlets.
这些值必须与两个portlet之间的属性转换相匹配。
These values must match for a property transfer between two portlets.
这些值必须与两个portlet之间的属性转换相匹配。
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