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Lines:

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Lines are represented by LineStrings. LineStrings are simple linear features constructed from a series of points joined by straight lines. Again there are two flavors - one with and one with . The second is the preferred one, but coordinates are still available for GML2 compatibility. Note that in coordinates the X and Y are separated by commas and the coordinates are separated by spaces. In a posList there is an attribute dimension which tells users how many elements there are to each point (that is: is it just X and Y or X, Y, Z) and then each number is separated by a space or a return.

<complexType name="LineStringType">
   <annotation>
      <documentation>
         A LineString is a special curve that consists
         of a single segment with linear interpolation.
         It is defined by two or more coordinate tuples,
         with linear interpolation between them.
         It is backwards compatible with the LineString
         of GML 2, GM_LineString of ISO 19107 is
         implemented by LineStringSegment.
      </documentation>
   </annotation>
   <complexContent>

      <extension base="gml:AbstractCurveType">
         <sequence>
            <choice>
               <choice minOccurs="2" maxOccurs="unbounded">
                  <element ref="gml:pos"/>
                  <element ref="gml:pointRep"/>

                  <element ref="gml:coord"/>
               </choice>
               <element ref="gml:coordinates"/>
            </choice>
         </sequence>
      </extension>

   </complexContent>
</complexType>

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