{
    if (xMLNSPrefixMap == null)
    {
      xMLNSPrefixMap = new EcoreEMap<String,String>(EcorePackage.Literals.ESTRING_TO_STRING_MAP_ENTRY, EStringToStringMapEntryImpl.class, this, XMLNamespacePackage.XML_NAMESPACE_DOCUMENT_ROOT__XMLNS_PREFIX_MAP);
    }
    return xMLNSPrefixMap;
  }