surfaces 

The surfaces element holds all the surfaces
that are needed for the brep structure. Here
are the surfaces that describes the kind of
a face. This element is needed, if the faces
element is present.

Element Information

Model

surface+ , extra*
Children: extra, surface

Source 

<xs:element name="surfaces" type="surfaces_type" minOccurs="0">
  <xs:annotation>
    <xs:documentation>The surfaces element holds all the surfaces that are needed for the brep structure. Here are the surfaces that describes the kind of a face. This element is needed, if the faces element is present.</xs:documentation>
  </xs:annotation>
</xs:element>

Sample