<graph string='Sale Paid Grapg' type="pivot">
<field name='section_id' type="row"/>
<field name='date' type="col"/>
<field name='paid_amount' type="measure"/>
</graph>
graph type 指定默认图表类型 可选值有 :pivot, bar, pie, line
field type 指定显示属性 col代表纵轴 row代表横轴。