How to beautify XML source code?

After applying a XSLT stylesheet the resulting XML doc is rather scrambled.
Many tags are concatenated on a single line instead of split over multiple lines
and indended.

Currently I have to insert <xsl:text> &#10;</xsl:text> tages to get lines split. Very unconfortable.

How can I beautify such an ugly (but valid) XML doc otherwise?

Is there a source code beautifier XSL script or command line option (for Saxon)?

Ben