[xsl] Keeping current attributes while adding attributes and content from another element

["Mark Wilson" <mark@xxxxxxxxxxxx>]

See the contrived example below

I can't seem to get this one (step 2 only)
For the <Heading> element, I need to
(1) remove its content;
(2) Keep its attributes and add the attributes [both will vary greatly in 
name and number] from <SubDiv1> to them
(3) Give it the content from <SubDiv1>
I know how to do (1) and (3), and how to rename <SubDiv2> to <SubDiv1>, but 
step (2) above is flummoxing me.
Thanks,
Mark

<Subject>
        <Heading entry="subject" location="file1">Localities</Heading>
        <SubDiv1 subject-type="city">Levoca</SubDiv1>
        <SubDiv2 pofis="1" pofis-number="234" scott="1" 
scott-number="143">1928. Jubilee Issue of 1928</SubDiv2>
     </Subject>

and I want to have
<Subject>
        <Heading entry="subject" location="file1" 
subject-type="city">Levoca</Heading>
        <SubDiv1 pofis="1" pofis-number="234" scott="1" 
scott-number="143">1928. Jubilee Issue of 1928</SubDiv1>
     </Subject>