code: @Override
  	public Pattern constructPattern()
  	{
  		Pattern p = new Pattern(SmallMoleculeReference.class, "SMR");
  		p.add(new Size(
  			new PathConstraint("SmallMoleculeReference/entityReferenceOf/participantOf:Conversion"),
  			50, Size.Type.GREATER_OR_EQUAL), "SMR");
  		return p;
  	}
docs: Constructs the pattern.
  @return pattern