Apply tag problem propertXsl nameXsl

[covax]

Hi All!   When I use <xsl:apply nameXsl="MessageId" propertyXsl="MediumFormat">   instead of <xsl:apply xsl="proper_filename.xsl">   xalan says: The markup in the document preceding the root element must be well-formed. but in case of "<xsl:apply xsl="proper_filename.xsl">" it's fine...   what might be wrong?   Thanx a lot for any help