public SpecialTokens getSpecialTokens(String name) {
        if (name == null || name.trim().equals(""))
            name = "default";
        return specialTokenMap.getOrDefault(name, SpecialTokens.empty());
    }
Returns the list of special tokens for a given name.

@param  name the name of the special tokens to return
        null, the empty string or the string "default" returns
        the default ones
@return a read-only list of SpecialToken instances, an empty list if this name
        has no special tokens
linguistics/src/main/java/com/yahoo/language/process/SpecialTokenRegistry.java