#!/usr/bin/python -u## this tests the Expand() API of the xmlTextReader interface# this extract the Dragon bibliography entries from the XML specification#import libxml2import StringIOimport sys # Memory debug specificlibxml2.debugMemory(1) expect="""<bibl id="Aho" key="Aho/Ullman">Aho, Alfred V., Ravi Sethi, and Jeffrey D. Ullman.<emph>Compilers:  Principles, Techniques, and Tools</emph>.Reading:  Addison-Wesley, 1986, rpt. corr. 1988.</bibl>""" f = open('../../test/valid/REC-xml-19980210.xml')input = libxml2.inputBuffer(f)reader = input.newTextReader("REC")res=""while reader.Read():    while reader.Name() == 'bibl':        node = reader.Expand()            # expand the subtree        if node.xpathEval("@id = 'Aho'"): # use XPath on it            res = res + node.serialize()        if reader.Next() != 1:            # skip the subtree            break; if res != expect:    print "Error: didn't get the expected output"    print "got '%s'" % (res)    print "expected '%s'" % (expect)     ## cleanup#del inputdel reader # Memory debug specificlibxml2.cleanupParser()if libxml2.debugMemory(1) == 0:    print "OK"else:    print "Memory leak %d bytes" % (libxml2.debugMemory(1))    libxml2.dumpMemory()