Simple multiprocessing XML parser

gistfile1.py

#!/usr/bin/env python

import lxml.etree as tr
import oursql
import time
import signal
import sys
from multiprocessing import Process, Queue
from collections import deque

errors = 0

def mainParser(queue):
	context = tr.iterparse('content.rdf.u8', events=('end',), tag='{http://dmoz.org/rdf/}ExternalPage')
	XMLNS_D = '{http://purl.org/dc/elements/1.0/}'		
	for event, elem in context:

	    if(queue.qsize() > 12000):
		time.sleep(5)
	    
	    queue.put(tr.tostring(elem))
	    #print "Main "+str(queue.qsize())
	    elem.clear()
	    while elem.getprevious() is not None:
	        del elem.getparent()[0]

def xmlParser(queue):
	    XMLNS_D = '{http://purl.org/dc/elements/1.0/}'
	    conn = oursql.connect("HIDDEN")
	    curs = conn.cursor(try_plain_query=False)
            curs.execute("SET NAMES utf8")

	    while(queue.qsize() >= 0):
		elem = tr.fromstring(queue.get())
		
		title = elem.find(XMLNS_D + 'Title').text
		if title is not None:
			title = title

		descr = elem.find(XMLNS_D + 'Description').text
		if descr is not None:
			descr = descr

		url =  elem.attrib['about']

		try:
                	curs.execute('INSERT INTO table (url, title, descr) VALUES(?, ?, ?)', (url, title, descr))
		except:
			print "Error"
		

def xmlSecondParser(queue):
            XMLNS_D = '{http://purl.org/dc/elements/1.0/}'
            conn = oursql.connect("HIDDEN")
            curs = conn.cursor(try_plain_query=False)
	    curs.execute("SET NAMES utf8")

            while(queue.qsize() >= 0):
                elem = tr.fromstring(queue.get())
		
                title = elem.find(XMLNS_D + 'Title').text
                if title is not None:
                        title = title

                descr = elem.find(XMLNS_D + 'Description').text
                if descr is not None:
                        descr = descr

                url =  elem.attrib['about']

                try:
                        curs.execute('INSERT INTO table (url, title, descr) VALUES(?, ?, ?)', (url, title, descr))
                except:
                        print "Error"


if __name__ == '__main__':
	q = Queue()
	xmlParser = Process(target=xmlParser, args=(q,)) #XML PARSER PARSES DATA FROM NODES
	xmlSecondParser = Process(target=xmlSecondParser, args=(q,)) #XML PARSER PARSES DATA FROM NODES
	mainParser = Process(target=mainParser, args=(q,)) #MAIN XML PARSE SINGLE NODES		
	mainParser.start()
	xmlParser.start()
	xmlSecondParser.start()
	print "main "+str(mainParser.pid)
        print "one "+str(xmlParser.pid)
        print "sec "+str(xmlSecondParser.pid)