gets the value of the holdingexternal property . concode_field_sep List<PhysicalLocationType> physicalLocation concode_elem_sep List<String> shelfLocator concode_elem_sep HoldingSimpleType holdingSimple concode_elem_sep List<UrlType> url concode_elem_sep ExtensionType holdingExternal concode_field_sep List<UrlType> getUrl concode_elem_sep HoldingSimpleType getHoldingSimple concode_elem_sep List<PhysicalLocationType> getPhysicalLocation concode_elem_sep void setHoldingExternal concode_elem_sep void setHoldingSimple concode_elem_sep List<String> getShelfLocator
ExtensionType function ( ) { return holdingExternal ; }