code: public boolean covers(String uri) {
      // any namspace covers only the any namespace uri
      // no wildcard ("") requires equality between namespaces.
      if (ANY_NAMESPACE.equals(ns) || "".equals(wildcard)) {
        return ns.equals(uri);
      }
      String[] parts = split(ns, wildcard);    
      // no wildcard
      if (parts.length == 1) {
        return ns.equals(uri);
      }
      // at least one wildcard, we need to check that the start and end are the same
      // then we get to match a string against a pattern like *p1*...*pn*
      if (!uri.startsWith(parts[0])) {
        return false;
      }
      if (!uri.endsWith(parts[parts.length - 1])) {
        return false;
      }
      // Check that all remaining parts match the remaining URI.
      int start = parts[0].length();
      int end = uri.length() - parts[parts.length - 1].length();
      for (int i = 1; i < parts.length - 1; i++) {
        if (start > end) {
          return false;
        }
        int match = uri.indexOf(parts[i], start);
        if (match == -1 || match + parts[i].length() > end) {
          return false;
        }
        start = match + parts[i].length();
      }    
      return true;
    }
docs: Checks if a namespace specification covers a specified URI.
  any namespace pattern covers only the any namespace uri.
  @param uri The uri to be checked.
  @return true if the namespace pattern covers the specified uri.