bool IsLine(McDbObjectId entId)
            {
                McDbObjectPointer<McDbEntity> spEnt(entId,McDb::kForRead);
                if(spEnt.openStatus() != Mcad::eOk)
                    return false;

                McDbLine* pLine = McDbLine::cast(spEnt.object());
                if(pLine != NULL)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }