XML doc generation

[Jonathan Pennington]

I need some XML help. Here's a snippet from the XML How-To:
<snip>
You can also construct a DOM tree yourself, and convert it to XML;
this is often a more flexible way of producing XML output than simply
writing <tag1>...</tag1> to a file. 
<snip>
Unfortunately, I can't find an example of this.

Does anyone have some code(script?) I can read that does this so I can
learn? Much of what I see in docs/archives is parsing of an XML
document. I, however, have long strings of coordinate data and info
that I currently parse into a large nested dictionary. I'd like to be
able to convert this into an XML format instead of or in addition to a
dictionary. 

Thanks,
-J

---- problem example for the more curious ----

I have a string returned as this just to ease splitting of multiple data
types (ie. some have more or less info than this):

"name:V:WAYPNT:R:comment:V:Test Waypoint data:R:latitude:V:-345689284304 \
:R:longitude:V:948502987435:R:proximity:V:83:R:symbol:V:8345:R:display:V:0"

I don't have a DTD finished yet, but would like something like this, I
just don't want to manually add the tags all the time (ie. I'll
generate them based on the dictionary's "has key" membership):

<DataSet type="coordinate">              .... Also mineral, lithologic, etc.
    <CoordinateSet type="waypoint">           Also route, track, group, etc.
        <datapoint number="gh456">            Unique identifier for each
            <name>WAYPNT</name>
	    <comment>Test Waypoint Data</comment>
	    <coordinates>
	        -0893274924,0928093840
	    </coordinates>
	    <proximity type="waypoint" location="gh455">
		83
	    </proximity>
	    <symbol>8345</symbol>
	    <display>0</display>
        </datapoint>
    </CoordinateSet>
</DataSet>

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