format <xsl:message> output

I am using xsl:message in an ant build script to log error messages. The
problem is that I get the following message *not* as a single line but
as display below. I am using Saxon 8.

<xsl:message terminate="no">
  [<xsl:value-of select="$type"/> | <xsl:value-of select="$task"/> |
'<xsl:value-of select="$location"/>']
  <xsl:value-of select="$message"/>
</xsl:message>

Output:
-------
...
[xslt] -[ERROR | 4 | '/contacts.xml']
[xslt] relation to external/adressen.xml
[xslt] invalid! expected: address  |
[xslt] found: bank

I want:
-------
[xslt] -[ERROR | 4 | '/contacts.xml'] relation to external/adressen.xml
invalid! expected: address | found: bank

Any ideas or is this an ant issue?

R.