VXL reference: dxf diagnostics

Code	Phase	Severity	Meaning and hint
`VXL-C560`	Parse	error	malformed DXF tags or sections; Supply a syntactically valid ASCII or R13+ binary DXF; do not repair corrupt numeric input.
`VXL-C561`	Parse	error	DXF resource limit exceeded; Reduce the source to 4 MiB, 100000 entities and the documented group/vertex/control limits.
`VXL-C562`	Parse	error	invalid DXF numeric, count or knot vector; Supply finite fully parsed coordinates, valid counts and a valid polynomial spline knot vector.
`VXL-C563`	Parse	error	unsupported selected DXF entity or property; Select admitted planar entities or remove the unsupported construct in the authoring tool; no approximation is performed.
`VXL-C564`	Parse	error	missing or contradictory DXF units; For unitless files explicitly declare mm or inch; do not contradict declared INSUNITS.
`VXL-C565`	Parse	error	unsupported DXF OCS or frame; Use z=0 and default +Z extrusion, with a finite unit, mirror, rotation and translation frame.
`VXL-C566`	Parse	error	DXF selection missing or ambiguous; Select an existing exact layer and unique hexadecimal handle, intersecting the selectors.
`VXL-C567`	Parse	error	DXF entities do not form unambiguous closed loops; Close every chain within 1e-6 mm; remove branches, duplicate boundaries or ambiguous joins. No gaps are healed.
`VXL-C568`	Parse	error	DXF output refused; Use an exact profile or planar solid section with orthogonal nonzero axes and admitted DXF carriers.
`VXL-C569`	Parse	error	DXF source descriptor or captured bytes mismatch; Supply image/vnd.dxf bytes matching the declared Source digest and byte length.