@Override
	public void restoreXml(XmlPullParser parser) throws XmlParseException {
		XmlElement elem = parser.start(ELEM_POSITION.name());
		position = SpecXmlUtils.decodeInt(elem.getAttribute(ATTRIB_INDEX.name()));
		parser.end(elem);
	}
Filter that selects for a particular parameter position.
This matches if the position of the current parameter being assigned, within the data-type
list, matches the position attribute of this filter.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/lang/protorules/PositionMatchFilter.java