Class <<FeatureType>> GeologicFeature

<xs:element xmlns:xs="http://www.w3.org/2001/XMLSchema" abstract="true" name="GeologicFeature" substitutionGroup="gml:_Feature" type="gsml:GeologicFeatureType">
    <xs:annotation>
        <xs:documentation>The abstract GeologicFeature class represents a conceptual feature that is hypothesized to exist coherently in the world.
   * this corresponds with a "legend item" from a traditional geologic map
   * while the bounding coordinates of a Geologic Feature may be described, its shape is not.

The implemented Geologic Feature instance acts as the "description package"

    * the description package is classified according to its purpose as an Instance, TypicalNorm, or DefiningNorm.</xs:documentation>
    </xs:annotation>
</xs:element>

<xs:complexType xmlns:xs="http://www.w3.org/2001/XMLSchema" abstract="true" name="GeologicFeatureType">
    <xs:complexContent>
        <xs:extension base="gml:AbstractFeatureType">
            <xs:sequence>
                <xs:element maxOccurs="unbounded" minOccurs="1" name="observationMethod" type="gsml:CGI_TermValuePropertyType">
                    <xs:annotation>
                        <xs:documentation>Term(s) that specify the method by which the values for the GeologicFeature were obtained (e.g. point count, brunton compass on site, air photo interpretation,  field observation, hand specimen,  laboratory, aerial photography, creative imagination...). This corresponds (loosely) to ISO19115 Lineage.

Statement specifies the method that was used to identify the MappedFeature. Examples: .</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:element name="purpose" type="gsml:DescriptionPurposeType">
                    <xs:annotation>
                        <xs:documentation>Specification of the intended purpose/level of abstraction for a given feature or object instance. Scoped name because intention is asserted by author of the data instance. Values: Instance, TypicalNorm, IdentifyingNorm.</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:element maxOccurs="unbounded" minOccurs="0" name="occurrence" type="gsml:MappedFeaturePropertyType">
                    <xs:annotation>
                        <xs:documentation>Points to any number of mapped features which are occurrences of the geologic feature.  Mapped features may all be from a single map or from several maps.</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:element maxOccurs="1" minOccurs="0" name="preferredAge" type="gsml:GeologicEventPropertyType">
                    <xs:annotation>
                        <xs:documentation>Specifies the geologic event that the data supplier considers the 'preferred' event age and event process for that feature.
This is the age and process of the feature that would be commonly shown on a geologic map (eg deposition age, peak temperature age, intrusion age).
Normative geologic unit descriptions are expected to include an age specification whenever the age is constrained--even if the range is very large (e.g. Phanerozoic....).</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:element maxOccurs="unbounded" minOccurs="0" name="geologicHistory" type="gsml:GeologicEventPropertyType">
                    <xs:annotation>
                        <xs:documentation>A sequence of GeologicEvents with role geologicHistory allow describing the Genesis of the GeologicFeature. In future versions of GeoSciML this sequence should be ordered.</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:element maxOccurs="unbounded" minOccurs="0" name="targetLink" type="gsml:GeologicFeatureRelationPropertyType">
                    <xs:annotation>
                        <xs:documentation>Specifies the GeologicFeatureRelation that links the 'source' GeologicFeature  to the 'target' GeologicFeature.</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:element maxOccurs="1" minOccurs="0" name="metadata" type="gml:ReferenceType">
                    <xs:annotation>
                        <xs:appinfo>
                            <gml:targetElement xmlns:gml="http://www.opengis.net/gml">gmd:MD_Metadata</gml:targetElement>
                        </xs:appinfo>
                        <xs:documentation>feature level metadata associated with the GeologicFeature</xs:documentation>
                    </xs:annotation>
                </xs:element>
            </xs:sequence>
        </xs:extension>
    </xs:complexContent>
</xs:complexType>

<xs:complexType xmlns:xs="http://www.w3.org/2001/XMLSchema" name="GeologicFeaturePropertyType">
    <xs:sequence minOccurs="0">
        <xs:element ref="gsml:GeologicFeature"/>
    </xs:sequence>
    <xs:attributeGroup ref="gml:AssociationAttributeGroup"/>
</xs:complexType>