c# - 仅当子元素具有特定数量的元素时才选择父元素

Question

我正在尝试获取所有 <Opening>标记其 <PlanarGeometry>的 <Polyloop>有数量 CartesianPoint > 4.

Xml 标记表面是另一个的子标记。

<Surface id="su-137" surfaceType="InteriorWall" constructionIdRef="ASHIW23" xmlns="http://www.gbxml.org/schema">
 <Name>W-106-114-I-W-137</Name>
 <Opening id="su-137-op-1" openingType="NonSlidingDoor" constructionIdRef="MDOOR">
 <Name>W-106-114-I-W-137-D-1</Name>
   <PlanarGeometry>
      <PolyLoop> 
         <CartesianPoint><Coordinate>55.570238</Coordinate><Coordinate>92.571596</Coordinate>
         <Coordinate>0.000000</Coordinate></CartesianPoint><CartesianPoint>         <Coordinate>55.570238</Coordinate><Coordinate>92.571596</Coordinate><Coordinate>6.666667</Coordinate>     
         </CartesianPoint>
         <CartesianPoint>
         <Coordinate>55.570238</Coordinate><Coordinate>95.571596</Coordinate><Coordinate>6.666667</Coordinate></CartesianPoint>
         <CartesianPoint>
         <Coordinate>55.570238</Coordinate><Coordinate>95.571596</Coordinate><Coordinate>0.000000</Coordinate>
        </CartesianPoint>
     </PolyLoop>
   </PlanarGeometry>
 </Opening>              
</Surface>

我从中得到的引用很少 - Xpath to select only nodes where child elements exist? SO 线程并从下面的示例中得到了很少的帮助。

book[author/degree]
All <book> elements that contain <author> children that in turn contain at least one <degree> child.

如何使用 xPath 或其他方式实现此目的？？？

Answer 1

I am trying to fetch all <Opening> tag whose <PlanarGeometry>'s <Polyloop> has number of CartesianPoint > 4.

假设 Surface element 是您当前的上下文节点:

gb:Opening[gb:PlanarGeometry/gb:Polyloop[count(gb:CartesianPoint) > 4]]

gb前缀需要映射到 http://www.gbxml.org/schema命名空间 URI。这将选择所有 Opening至少包含一个 Polyloop 的元素超过 4 CartesianPoint children 。