Ordered list of labels for all the axes of this CRS. The gml:axisAbbrev value should be used for these axis 
				labels, after spaces and forbiddden characters are removed. When the srsName attribute is included, this attribute is optional. 
				When the srsName attribute is omitted, this attribute shall also be omitted.

The degree for a cubic spline is "3".

This attribute is included for backward compatibility with GML 2 and is deprecated with GML 3. 
						This identifer is superceded by "gml:id" inherited from AbstractGMLType. The attribute "gid" should not be used 
						anymore and may be deleted in future versions of GML without further notice.

Database handle for the object.  It is of XML type ID, so is constrained to be unique in the XML document within which it occurs.  An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.  This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.

The attribute "interpolation" specifies the curve interpolation mechanism used for this segment. This mechanism uses the control points and control parameters to determine the position of this curve segment. For a CubicSpline the interpolation is fixed as "cubicSpline".

The "srsDimension" is the length of coordinate sequence (the number of entries in the list). This dimension is 
				specified by the coordinate reference system. When the srsName attribute is omitted, this attribute shall be omitted.

In general this reference points to a CRS instance of gml:CoordinateReferenceSystemType 
				(see coordinateReferenceSystems.xsd). For well known references it is not required that the CRS description exists at the 
				location the URI points to. If no srsName attribute is given, the CRS must be specified as part of the larger context this 
				geometry element is part of, e.g. a geometric element like point, curve, etc. It is expected that this attribute will be specified 
				at the direct position level only in rare cases.

Ordered list of unit of measure (uom) labels for all the axes of this CRS. The value of the string in the 
				gml:catalogSymbol should be used for this uom labels, after spaces and forbiddden characters are removed. When the 
				axisLabels attribute is included, this attribute shall also be included. When the axisLabels attribute is omitted, this attribute 
				shall also be omitted.