Question

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

Xml tag surface is child of another.

<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>

I got little reference from this – Xpath to select only nodes where child elements exist? SO thread and got little help from below example.

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

How can i achieve this using xPath or another way???

Answer 1

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

Assuming the Surface element is your current context node then:

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

The gb prefix needs to be mapped to the http://www.gbxml.org/schema namespace URI. This will select all Opening elements that contain at least one Polyloop with more than 4 CartesianPoint children.