XHTML output and special character entities

I have a XML source file which uses iso-8859-1 encoding such that I can
enter German umlauts easily.

I used

<xsl:output method="html"/>

in the XSLT Script to produce HTML output. The umlauts where transformed to
the appropriate entity (ü -> &uuml;) .

Now I wanted to create XHTML output instead of HTML.
I changed the output method to xml and tried different encodings, for
instance:

<xsl:output method="xml"
  doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";
  doctype-public="-//W3C//DTD XHTML 1.0 Transitional//EN" indent="yes"
  encoding="iso-8859-1" />

But I do not know how I can get the xslt processor to transform the umlauts
into their corresponding entity. Do I have to use xhtml-lat1.ent (and the
other entities files) somehow?

I'm using SAXON 6.5.2.

Thanks for any hint!
Hannes Schmiderer


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