curves 

The curves element holds all the curves that
are needed for the brep structure. Here are
the curves that describes the kind of an
edge, but here are also the curves that are
needed to create a extrusion for a surface.
This element is needed, if the edges element
is present.

Element Information

Model

curve+ , extra*
Children: curve, extra

Source 

<xs:element name="curves" type="curves_type" minOccurs="0">
  <xs:annotation>
    <xs:documentation>The curves element holds all the curves that are needed for the brep structure. Here are the curves that describes the kind of an edge, but here are also the curves that are needed to create a extrusion for a surface. This element is needed, if the edges element is present.</xs:documentation>
  </xs:annotation>
</xs:element>

Sample