private String getNamespace(final CharSequence tagName) {
    final String namespacePrefix;
    int pos = StringUtil.indexOf(tagName, ':');
    if (pos == -1) {
      namespacePrefix = "";
    }
    else {
      namespacePrefix = tagName.subSequence(0, pos).toString();
    }

    for (int i = myPrefixesStack.size() - 1; i >= 0; i--) {
      if (namespacePrefix.equals(myPrefixesStack.get(i))) return myNamespacesStack.get(i);
    }

    return "";
  }
private String getNamespace(final CharSequence tagName)