Make ogr2ogr extract subelements of feature element

[jorn@…]

Only direct childs of the <feature> element is
extracted to PostGIS. Is it possible to implement so that all childs and
sub-elements are extracted.

Two solutions:

<date>
  <year>2005</year>
  <month>December</month>
  <day>25</day>
</date>

would appear in the result as attributes:
date_year: 2005
date_month: December
date_day: 25

Or XML subelements as separate tables and foreign keys:


<gml:featureMember>
                <ais:feature>
                        <ais:MMSI>123456</ais:MMSI>
                        <ais:callsign>"CallMe"</ais:callsign>
                        <ais:name>"MS Ship</ais:name>
                        <ais:IMONumber>65432d1</ais:IMONumber>
                        <ais:length>75.3</ais:length>
                        <ais:beam>35.</ais:beam>
                        <ais:wesselType>cargo</ais:wesselType>
                        <ais:antennaLocation>aft of bow</ais:antennaLocation>
                        <ais:draught>3.2</ais:draught>
                        <ais:hazardousCargo>none</ais:hazardousCargo>
                        <ais:destination>Rotterdam</ais:destination>
                        <ais:expectedTimeOfArrival>2005-08-13T15:00:00</ais:
expectedTimeOfArrival>
                        <ais:extraInfo>none</ais:extraInfo>
                        <ais:trackProperty>
                                <ais:track>
                                        <ais:objectStatus>
                                                <gml:pos srsName="LL-WGS84">17.0 
69.0</gml:pos>
                                                <ais:time>2005-08-13T04:37:15</
ais:time>
                                                <ais:speedOverGround>11.</ais:
speedOverGround>
                                                <ais:courseOverGround>17.3</ais:
courseOverGround>
                                                <ais:heading>16.0</ais:heading>
                                                <ais:bearing>15.3</ais:bearing>
                                                <ais:rateOfTurn>2.14</ais:
rateOfTurn>
                                                <ais:
navigationalStatus>underway</ais:navigationalStatus>
                                                <ais:safetyMessage>none</ais:
safetyMessage>
                                                <ais:dataSource>AIS transp. sys. 
x</ais:dataSource>
                                        </ais:objectStatus>
                                        <ais:objectStatus>
                                                <gml:pos>17.5 69.5</gml:pos>
                                                <ais:time>2005-08-13T04:38:00</
ais:time>
                                                <ais:speedOverGround>11.</ais:
speedOverGround>
                                                <ais:courseOverGround>17.3</ais:
courseOverGround>
                                        </ais:objectStatus>
                                </ais:track>
                        </ais:trackProperty>
                        <ais:time>1967-08-13T17:39:15</ais:time>
                        <ais:dataSource>Kystverket</ais:dataSource>
                        </ais:feature>
        </gml:featureMember>

would in PostGIS result in the following tables:
ais:feature
ais:trackProperty with foreign key (fk) to ais:feature
ais:track with fk to ais:trackPropery
ais:objectStatus with fk to ais:track