Using Python xml.sax to parse XML file and values are read twice?

I am trying to read a XML file using Python xml.sax.

The XML file is composed of blocks looks like below:

<NS:Member>
<NS:Area fid='120410'>
<NS:Code>10021</NS:Code>
<NS:version>4</NS:version>
<NS:versionDate>2004-03-29</NS:versionDate>
<NS:theme>Buildings</NS:theme>
<NS:Value>42.826432</NS:Value>
<NS:changeHistory>
    <NS:changeDate>2002-09-26</NS:changeDate>
    <NS:reasonForChange>New</NS:reasonForChange>
</NS:changeHistory>
<NS:changeHistory>
    <NS:changeDate>2003-10-24</NS:changeDate>
    <NS:reasonForChange>Attributes</NS:reasonForChange>
</NS:changeHistory>
<NS:changeHistory>
    <NS:changeDate>2004-03-18</NS:changeDate>
    <NS:reasonForChange>Attributes</NS:reasonForChange>
</NS:changeHistory>
<NS:Group>Building</NS:Group>
<NS:make>Manmade</NS:make>
<NS:Level>50</NS:Level>
<NS:polygon>
    <NS2:Polygon srsName='NS2:BNG'>
    <NS2:Boundary>
        <NS2:LinearRing>
            <NS2:coordinates>383415.110,400491.900 383411.090,400485.570 383415.500,400482.770 383420.430,400490.530 383418.780,400491.580 383417.930,400490.240 383415.160,400491.980 383415.110,400491.900 
            </NS2:coordinates>
        </NS2:LinearRing>
    </NS2:Boundary>
    </NS2:Polygon>
</NS:polygon></NS:Area>
</NS:Member>

I am only interested at the ID, Group, make and coordinates part in the XML file.

And the code I use is:

import xml.sax

class MyHandler(xml.sax.ContentHandler):

    def __init__(self):
        self.__CurrentData = ""
        self.__ID = ""
        self.__Group = ""
        self.__make = ""
        self.__coordinates = []
        self.__coordString = ""


    def startElement(self, tag, attributes):
        self.__CurrentData = tag
        if tag == "NS:Area":
            self.__ID = attributes["fid"]
            print "ID: ", self.__ID


    def endElement(self, tag):
        if self.__CurrentData == "NS:Group":
            print "Group: ", self.__Group

        elif self.__CurrentData == "NS:make":
            print "Make: ", self.__make

        elif self.__CurrentData == "NS2:coordinates":
            print "coordinates: ", self.__coordString

            if self.__descriptiveGroup == "Building" and self.__make == "Manmade":
            """ ==== Parse Coordinates ==== """
            self.__coordinates = []
            for point in self.__coordString.split():
                x = float(point.split(",")[0])
                y = float(point.split(",")[1])
                self.__coordinates.append([x, y])

        self.__CurrentData = ""


    def characters(self, content):
        if self.__CurrentData == "NS:Area":
            self.__ID = content
        elif self.__CurrentData == "NS:Group":
            self.__Group = content
        elif self.__CurrentData == "NS:make":
            self.__make = content
        elif self.__CurrentData == "NS2:coordinates":
            self.__coordString = content

So I expected the output as:

ID: 120410

Group: Building

Make: Manmade

coordString: 383415.110,400491.900 383411.090,400485.570 383415.500,400482.770 383420.430,400490.530 383418.780,400491.580 383417.930,400490.240 383415.160,400491.980 383415.110,400491.900

coordinates: 383415.110,400491.900 383411.090,400485.570 383415.500,400482.770 383420.430,400490.530 383418.780,400491.580 383417.930,400490.240 383415.160,400491.980 383415.110,400491.900

However, what I've got is:

ID: 120410

Group: Building

Make: Manmade

coordString: 383415.110,400491.900 383411.090,400485.570 383415.500,400482.770 383420.430,400490.530 383418.780,400491.580 383417.930,400490.240 383415.160,400491.980 383415.110,400491.900

coordString: 0491.980 383415.110,400491.900

coordinates: 0491.980 383415.110,400491.900

It seems that the parser has read the coordinates twice, and the second time is wrong. Thus when I split the coordinates and put them into a list, it generated such errors:

File "C:\Users\Tim\Documents\Aptana Studio 3 Workspace\OSXMLReader\MyXMLParser.py", line 59, in endElement

y = float(point.split(",")[1]) IndexError: list index out of range

This is really haunting me for a while, so I really appreciate if someone can help me out.

Many thanks.