def METHOD_NAME(elem, loader=None):
    if loader is None:
        loader = default_loader
    # look for xinclude elements
    i = 0
    while i < len(elem):
        e = elem[i]
        if e.tag == XINCLUDE_INCLUDE:
            # process xinclude directive
            href = e.get("href")
            parse = e.get("parse", "xml")
            if parse == "xml":
                node = loader(href, parse)
                if node is None:
                    raise FatalIncludeError(
                        "cannot load %r as %r" % (href, parse)
                        )
                node = copy.copy(node)
                if e.tail:
                    node.tail = (node.tail or "") + e.tail
                elem[i] = node
            elif parse == "text":
                text = loader(href, parse, e.get("encoding"))
                if text is None:
                    raise FatalIncludeError(
                        "cannot load %r as %r" % (href, parse)
                        )
                if i:
                    node = elem[i-1]
                    node.tail = (node.tail or "") + text + (e.tail or "")
                else:
                    elem.text = (elem.text or "") + text + (e.tail or "")
                del elem[i]
                continue
            else:
                raise FatalIncludeError(
                    "unknown parse type in xi:include tag (%r)" % parse
                )
        elif e.tag == XINCLUDE_FALLBACK:
            raise FatalIncludeError(
                "xi:fallback tag must be child of xi:include (%r)" % e.tag
                )
        else:
            METHOD_NAME(e, loader)
        i = i + 1