attribute value change

[Byomokesh Sahoo]

Would someone show me what the syntax is for replacing the value of an
attribute node?
<art>
<tit>Title here</tit>
<bn>46793</bn>
<p>some text here</p>
<chap id="ch1">
<p>some text here</p>
</chap>
<chap id="ch2">
<p>some text here</p>
</chap>
</art>

Output

<art>
<tit>Title here</tit>
<bn>46793</bn>
<p>some text here</p>
<chap id="46793_ch1"> <!-- add <bn>46793</bn> in id value. -->
<p>some text here</p>
</chap>
<chap id="46793_ch2">
<p>some text here</p>
</chap>
</art>


I want using xquery to change <bin> number value add in all chap id.


Thank you!
Byomokesh
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