Bilinear element

<region name="12345">
  <metadata/>

  <field name="coordinates">
    <component name="x"/>
    <compenent name="y"/>
    <component name="z"/>
  
    <parameters>
      <group name="node_1">
        <component name="x">
           0.0
        </component>
        <component name="y">
           0.0
        </component>
        <component name="z">
           0.0
        </component>
      </group>
      <group name="node_2">
        <component name="x">
           1.0
        </component>
        <component name="y">
           0.0
        </component>
        <component name="z">
           0.0
        </component>
      </group>
      <group name="node_3">
        <component name="x">
           0.0
        </component>
        <component name="y">
           1.0
        </component>
        <component name="z">
           0.0
        </component>
      </group>
      <group name="node_4">
        <component name="x">
           1.0
        </component>
        <component name="y">
           1.0
        </component>
        <component name="z">
           0.0
        </component>
      </group>
    </parameters>
  </field>
  
  <element name="element_1"
           dimension="2">
    <interior uri="http://www.cmiss.org/fieldml/2D_tensor_interior.xml"/>
  </element>

  <element-field element="element_1"
                 field="coordinates">
    <component name="x">
      <function uri="http://www.cmiss.org/fieldml/2D_tensor_linear_basis.xml"/>
    </component>
    <component name="y">
      <function uri="http://www.cmiss.org/fieldml/2D_tensor_linear_basis.xml"/>
    </component>
    <component name="z">
      <function uri="http://www.cmiss.org/fieldml/2D_tensor_linear_basis.xml"/>
    </component>
  </element-field>

  <field-parameters-to-element-parameter-map element="element_1"
                                             field="coordinates">
    <component name="x">
      <field-parameters-boolean-map>
         "node_1" "node_2" "node_3" "node_4"
      </field-parameters-boolean-map>
    </component>
    <component name="y">
      <field-parameters-boolean-map>
         "node_1" "node_2" "node_3" "node_4"
      </field-parameters-boolean-map>
    </component>
    <component name="z">
      <field-parameters-boolean-map>
         "node_1" "node_2" "node_3" "node_4"
      </field-parameters-boolean-map>
    </component>
  </element-field>

</region>