<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def log_flush_with_xml(self, data):
 """Flush logs for devices with a supplied xml string. From the Casper API docs: log, log_id, interval, and devices specified in an XML file. Sample file: <logflush> <log>policy</log> <log_id>2</log_id> <interval>THREE MONTHS</interval> <computers> <computer> <id>1</id> </computer> <computer> <id>2</id> </computer> </computers> </logflush> Args: data (string):
 XML string following the above structure or an ElementTree/Element. Elements: logflush (root) log (Unknown; "policy" is the only one listed in docs). log_id: Log ID value. interval: Combination of "Zero", "One", "Two", "Three", "Six", and "Day", "Week", "Month", "Year". e.g. ("Three+Months") Please note: The documentation for this specifies the singular form (e.g. "Month"), and plural ("Months") at different times, and further the construction is listed as "THREE MONTHS" elsewhere. Limited testing indicates that pluralization does not matter, nor does capitalization. The "+" seems optional as well. Please test! Device Arrays: Again, acceptable values are not listed in the docs, aside from the example ("computers"). Presumably "mobiledevices", and possibly "computergroups" and "mobiledevicegroups" work. Raises: JSSDeleteError if provided url_path has a >= 400 response. """

        if not isinstance(data, basestring):
            data = ElementTree.tostring(data)
        response = self.delete(data)