code: public static Builder from(URL xml) {
      return from(new XmlMultiConfiguration(xml, (identity, dom) -> new XmlConfiguration(dom)));
    }
docs: Create a builder seeded from an XML configuration.
  <p>
  Enclosed configurations will parsed using {@link XmlConfiguration#XmlConfiguration(Document)}.
  
  @param xml xml seed resource
  @return a builder seeded with the xml configuration
  @see XmlConfiguration#XmlConfiguration(Document)