@Override
	public PropertyMap<?> getPropertyMap(String propertyName) {
		return propertyMapCache.get(propertyName);
	}
Returns the PropertyMap with the given name or null if no PropertyMap
exists with that name.
@param propertyName the name of the property to retrieve.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/properties/DBPropertyMapManager.java