@Override
	public StructureDataType getRowDataType() {
		StructureDataType rowDt =
			new StructureDataType(new CategoryPath(PATH), "StandAloneSig Row", 0);
		rowDt.add(metadataStream.getBlobIndexDataType(), "Signature", null);
		return rowDt;
	}
Describes the StandAloneSig table. Each row represents a signature that isn't referenced by any other Table.
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/pe/cli/tables/CliTableStandAloneSig.java