@Override
    public Collection<String> getVariableResolverIterator()
    {
        if (umvariableResolver == null)
        {
            umvariableResolver = Collections.unmodifiableList(variableResolver);
        }
        return umvariableResolver;
    }
@ Override public Collection < String > getVariableResolverIterator ( ) { if ( umvariableResolver == null ) { umvariableResolver = Collections . unmodifiableList ( variableResolver ) ; } return umvariableResolver ; }
@return Collection over VariableResolver class names