creating a macro or something similar

I want to generate something like a macro in XML with the aid of the xsl stylesheet.

Is there a prefered possibility?

So I created a new Tag called for example <img/> to shorten an expression defined in the xsl stylesheet..

Now saxon should create a new xml file that is like the one before BUT every <img/> tag should completely be replaced by that defined longer expression.

How can I cause this replacement of this small parts in my whole document?

Any ideas?

Thanks
Timo
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