transformSerialXML fails to indent output

We’re running WM6.1, and pub.xslt.Transformations:transformSerialXML is ignoring the request to indent the XML output. Is there some trick to this, or is it a bug in the service?

We’re using the following tag:

<xsl:output method=“xml” version=“1.0” indent=“yes” />

Here’s the tag again (this forum seems to break on XML characters)

<xsl:output method=“xml” version=“1.0” indent=“yes”/>