Trim whitespace from parent element only

Question

I\'d like to trim the leading whitespace inside p tags in XML, so this:

  Hey, italics and italics!         


        

Answer 1

This stylesheet:

Output:

Hey, italics and italics!

Edit 2: Better expression (now only three function calls).

Edit 3: Matching the first descendant text node (not just the first node if it's a text node). Thanks to @Dimitre's comment.

Now, with this input:

  Hey, italics and italics!

Output:

Hey, italics and italics!