gpm2Iso

For NHD, ADCAN, AK: replace gmd:date gco:DateUnknown</gco:Date> </gmd:date> with <gmd:date gco:nilReason="unknown"/>

and

gmd:sourceExtent gmd:EX_Extent gmd:temporalElement gmd:EX_TemporalExtent gmd:extent gml:descriptionground condition</gml:description> <gml:timePosition indeterminatePosition="unknown"/> </gmd:extent> </gmd:EX_TemporalExtent> </gmd:temporalElement> </gmd:EX_Extent> </gmd:sourceExtent>

                 with (insert time instant)
                 
                 <gmd:sourceExtent>
                    <gmd:EX_Extent>
                       <gmd:temporalElement>
                          <gmd:EX_TemporalExtent>
                             <gmd:extent><!--in the  source citation--><!--In the NHD (source)--><!--TimePeriodD: NHD6178-->
                                <gml:TimeInstant gml:id ="NHD">
                                <gml:description>ground condition</gml:description>
                                <gml:timePosition indeterminatePosition="unknown"/></gml:TimeInstant>
                             </gmd:extent>
                          </gmd:EX_TemporalExtent>
                       </gmd:temporalElement>
                    </gmd:EX_Extent>
                 </gmd:sourceExtent>
                 
                 Fix the file:/H:/MetadataSchemas/xslts/gpm2iso/SourceInformation.xsl so that single dates can work!!!!!!!!!!!