private long getUniqueID(Element e, long defaultValue) {
		String attributeValue = e.getAttributeValue("INSTANCE_ID");
		if (attributeValue == null) {
			return defaultValue;
		}
		return Long.parseLong(attributeValue);
	}
Constructs a new component node from the given xml element.
@param element the xml element describing the configuration of this node.
@param windowManager the docking windows manager
@param parent the parent node for this node.
@param restoredPlaceholders the list into which any restored placeholders will be placed
Ghidra/Framework/Docking/src/main/java/docking/ComponentNode.java