[oXygen-user] xsl recursive condition

Hi all,
I've problem to select a value to one attribute:
i need to change the content of one element and to select the value by the attribute of another element.
Is it easy? sure, but problem is that i need to select the right element within all equal elements. Output is .xml
It's like this:

<bookstore>
<books>
<book ID=1>History of Italy</book>
<book ID=2>History of Spain</book>
<book ID=2/>Tales from China</book>
</books>
<other XML section>
<hand IDM=1 title=Italy/>
<hand IDM=2 title=Spain/>
<hand IDM=3 title=China/>
</other XML section>
</bookstore>

it will be like this:

<bookstore>
<books>
<book ID=1>Italy</book>
<book ID=2>Spain</book>
<book ID=2/>China</book>
</books>
<other XML section>
<hand IDM=1 title=Italy/>
<hand IDM=2 title=Spain/>
<hand IDM=3 title=China/>
</other XML section>
</bookstore>

How can i get it? Thanks everyone for help.