This function is
EXPERIMENTAL. The behaviour of this function, the
name of this function, and anything else documented about this
function may change without notice in a future release of PHP.
Use this function at your own risk.
Saves the SDO_DAS_XML_Document object to a file.
Optional argument to specify that the xml should be formatted. A non-negative integer is
the amount to indent each level of the xml. So, the integer 2, for example, will indent
the xml so that each contained element is two spaces further to the right than its
containing element. The integer 0 will cause the xml to be completely left-aligned.
The integer -1 means no formatting - the xml will come out on one long line.