def __call__(self, tag=None, ns=None, children=False, root=False,
                 error=True, ):
        "Search (even in child nodes) and return a child tag by name"
        try:
            if root:
                # return entire document
                return SimpleXMLElement(
                    elements=[self.__document.documentElement],
                    document=self.__document,
                    namespace=self.__ns,
                    prefix=self.__prefix,
                    namespaces_map=self.__namespaces_map
                )
            if tag is None:
                # if no name given, iterate over siblings (same level)
                return self.__iter__()
            if children:
                # future: filter children? by ns?
                return self.children()
            elements = None
            if isinstance(tag, int):
                # return tag by index
                elements=[self.__elements[tag]]
            if ns and not elements:
                for ns_uri in isinstance(ns, (tuple, list)) and ns or (ns, ):
                    log.debug('searching %s by ns=%s', tag, ns_uri)
                    elements = self._element.getElementsByTagNameNS(ns_uri, tag)
                    if elements: 
                        break
            if self.__ns and not elements:
                log.debug('searching %s by ns=%s', tag, self.__ns)
                elements = self._element.getElementsByTagNameNS(self.__ns, tag)
            if not elements:
                log.debug('searching %s', tag)
                elements = self._element.getElementsByTagName(tag)
            if not elements:
                #log.debug(self._element.toxml())
                if error:
                    raise AttributeError(u"No elements found")
                else:
                    return
            return SimpleXMLElement(
                elements=elements,
                document=self.__document,
                namespace=self.__ns,
                prefix=self.__prefix,
                namespaces_map=self.__namespaces_map)
        except __HOLE__, e:
            raise AttributeError(u"Tag not found: %s (%s)" % (tag, unicode(e)))
dataset/ETHPy150Open uwdata/termite-visualizations/web2py/gluon/contrib/pysimplesoap/simplexml.py/SimpleXMLElement.__call__