public void addAlias(final String alias) {
        if (aliases == null) {
            aliases = new ArrayList<>();
        }
        aliases.add(alias);
    }
A lookup value with optional aliases
<p>
toString just gives the primary value,
equals just compares against primary value
matches() also compares aliases

@author ab
main/src/main/java/cgeo/geocaching/brouter/expressions/BExpressionLookupValue.java