annular_width assertion board_edge buried_via clearance condition connection_width constraint courtyard_clearance diff_pair_gap diff_pair_uncoupled disallow edge_clearance error exclusion footprint graphic hole hole_clearance hole_size hole_to_hole ignore inner layer length max mechanical_clearance mechanical_hole_clearance micro_via min min_resolved_spokes none npth opt outer pad pth physical_clearance physical_hole_clearance rule severity silk_clearance skew solid text text_height text_thickness thermal_reliefs thermal_relief_gap thermal_spoke_width track track_width version via via_count via_diameter warning within_diff_pairs zone zone_connection