gml:OffsetCurve 

An offset curve is a curve at a constant distance from the basis curve. offsetBase is the base curve from which this curve is defined as an offset. distance and refDirection have the same meaning as specified in ISO 19107:2003, 6.4.23.
The content model follows the general pattern for the encoding of curve segments.

Element Information

Model

gml:offsetBase , gml:distance , gml:refDirection{0,1}
Children: gml:distance, gml:offsetBase, gml:refDirection

Attributes

QName Type Fixed Default Use Inheritable Annotation
numDerivativeInterior integer 0 optional
numDerivativesAtEnd integer 0 optional
numDerivativesAtStart integer 0 optional

Source 

<element name="OffsetCurve" type="gml:OffsetCurveType" substitutionGroup="gml:AbstractCurveSegment">
  <annotation>
    <documentation>An offset curve is a curve at a constant distance from the basis curve. offsetBase is the base curve from which this curve is defined as an offset. distance and refDirection have the same meaning as specified in ISO 19107:2003, 6.4.23. The content model follows the general pattern for the encoding of curve segments.</documentation>
  </annotation>
</element>

Sample