protected ObjectAttribute<Edge> getEdgeAttribute(String attribName) {
		AttributeManager<Edge> am = edgeAttributes();
		Attribute<Edge> attrib = am.getAttribute(attribName);

		if (attrib == null) {
			attrib = edgeAttributes().createAttribute(attribName, AttributeManager.OBJECT_TYPE);
			Msg.debug(this, "creating edge property: " + attribName);

		}
		return (ObjectAttribute<Edge>) attrib;

	}
This method gets and ObjectAttribute method give an attribute name.
If it is not found in the attribute manager, the attribute is 
created automatically.

@param attribName the name of the attribute
@return the attribute
Ghidra/Framework/Generic/src/main/java/ghidra/util/graph/DirectedGraph.java