code: public void setResourceAlias(String alias, String uri)
      {
          if (_resourceAliases == null)
              _resourceAliases= new HashMap(5);
          _resourceAliases.put(alias, uri);
      }
docs: Set Resource Alias.
  Resource aliases map resource uri's within a context.
  They may optionally be used by a handler when looking for
  a resource.
  @param alias
  @param uri