An object that defines uncertainty values for the coordinates of a location.Uncertainty values must be expressed in the same unit of measure as thecorresponding coordinate axis of the CRS of the associated geometry.
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.
Source
<element name="Uncertainty" type="diggs:UncertaintyType" abstract="false"><annotation><documentation>An object that defines uncertainty values for the coordinates of a location. Uncertainty values must be expressed in the same unit of measure as the corresponding coordinate axis of the CRS of the associated geometry.</documentation></annotation></element>