Place Input doctype-system and doctype-public in outpu

 Do you know  how to reuse the input doctype-system and doctype-public from the input file in the output file.
This would reduce the number of input parameters and the user would not have to know the correct dtd information.
This is how I would hard code it. I would like to avoid having to hard code it.
<xsl:output
   doctype-system="http://www.nlm.nih.gov/databases/dtd/premedlinecitation_011101.dtd"
   doctype-public="-//NLM//DTD -//NLM//DTD PreMedlineCitation, 1st November 2001//EN//EN"/>



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