XML

If I wanted to store the below XML in a text field, would I be able to
insert additional attributes, and/or be able to substitute the id of the
inner g tag when querying it from the database.  For example:

From:
<g id="myGtag>
    <g id="myGtag2">
    <\g>
<\g>

To:
<g id="myGtag>
    <g id="Button1a" onClick="click1();" >
    <\g>
<\g>

Thanks.

Sean.