Check for, Add or Delete String to Enumeration Type

Hello!

Has someone a good working DXL Snipplet, that adds a String to a Type Enumeration if it not exists?

I want to have a function like this.

void addStringToEnumeration(Module m, string typeToExtend, string newStringForEnumeration)
{
     // do s.th. here AND DO NOT AFFECT ASSIGNED ENUMERATION FIELDS
}

the same thing would be nice for a deleteion
 

void deleteStringFromEnumeration(Module m, string typeToModify, string deleteStringFromEnumeration)
{
     // do s.th. here AND DO NOT AFFECT ASSIGNED ENUMERATION FIELDS
}

bool checkIfEnumerationStringExist(Module m, string typeToCheck, string checkStringForEnumeration)

{

}