if (mp::xml::is_element_mp(a_node, "documentroot"))
a.m_file_root = mp::xml::get_text(a_node);
else if (mp::xml::is_element_mp(a_node, "prefix"))
a.m_url_path_prefix = mp::xml::get_text(a_node);
else
throw mp::filter::FilterException
if (mp::xml::is_element_mp(a_node, "documentroot"))
a.m_file_root = mp::xml::get_text(a_node);
else if (mp::xml::is_element_mp(a_node, "prefix"))
a.m_url_path_prefix = mp::xml::get_text(a_node);
else
throw mp::filter::FilterException