OGRSpatialReference *OGRProxiedLayer::GetSpatialRef()
{
    if( poSRS != NULL )
        return poSRS;
    if( poUnderlyingLayer == NULL && !OpenUnderlyingLayer() ) return NULL;
    OGRSpatialReference* poRet = poUnderlyingLayer->GetSpatialRef();
    if( poRet != NULL )
    {
        poSRS = poRet;
        poSRS->Reference();
    }
    return poRet;
}

OGRFeatureDefn *OGRProxiedLayer::GetLayerDefn()
{
    if( poFeatureDefn != NULL )
        return poFeatureDefn;

    if( poUnderlyingLayer == NULL && !OpenUnderlyingLayer() )
    {
        poFeatureDefn = new OGRFeatureDefn("");
    }
    else
    {
        poFeatureDefn = poUnderlyingLayer->GetLayerDefn();
    }

    poFeatureDefn->Reference();

    return poFeatureDefn;
}

OGRwkbGeometryType OGRProxiedLayer::GetGeomType()
{
    if( poUnderlyingLayer == NULL && !OpenUnderlyingLayer() ) return wkbUnknown;
    return poUnderlyingLayer->GetGeomType();
}

OGRLayer* OGRProxiedLayer::GetUnderlyingLayer()
{
    if( poUnderlyingLayer == NULL )
        OpenUnderlyingLayer();
    return poUnderlyingLayer;
}