OrientableCurve consists of a curve and an orientation. If the orientation is"+", then the OrientableCurve is identical to the baseCurve. If the orientation is "-", thenthe OrientableCurve is related to another AbstractCurve with a parameterization thatreverses the sense of the curve traversal.
Database handle for the object. It is of XML type ID, so is constrained to beunique in the XML document within which it occurs. An external identifier for the object inthe form of a URI may be constructed using standard XML and XPointer methods. This is doneby concatenating the URI for the document, a fragment separator, and the value of the idattribute.
<element name="OrientableCurve" type="gml:OrientableCurveType" substitutionGroup="gml:AbstractCurve"><annotation><documentation>OrientableCurve consists of a curve and an orientation. If the orientation is "+", then the OrientableCurve is identical to the baseCurve. If the orientation is "-", then the OrientableCurve is related to another AbstractCurve with a parameterization that reverses the sense of the curve traversal.</documentation></annotation></element>