[xsl] Checking if a file exists

["dvint@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

I need to take a list of XML files and rename them based upon values 
provided by the writer. I know that my list has duplicate name tokens 
for different files in the list. I do get duplicate names when 
generated.

I'm trying to trap this situation and handle this while creating the 
files, I have a template with this:

...

'<xsl:value-of select="$newFile"/>' found '<xsl:value-of 
select="doc-available($newFile)"/>'

<xsl:choose>
	<xsl:when test="doc-available($newFile)">
		<xsl:message>[ERROR] Renaming <xsl:value-of select="$base-filename"/> 
to Duplicate id= <xsl:value-of select="$newName"/></xsl:message>
	</xsl:when>
	<xsl:otherwise>
		<xsl:result-document
			href="{$rename-outPath}/{$newName}.dita"
			method="xml">
			<doc>
				<p>new file</p>
			</doc>
		</xsl:result-document>
	</xsl:otherwise>
</xsl:choose>

...

I get this output
'file:/Users/danvint/pubsrc/_src-data-files/asciidoc-processing/Ixia-Source/dita-files/test4/dita/rename/fs-concept-nest5.dita' 
found 'false'

and then the xslt fails because the file actually exists. I can look 
back at these messages and I see many files earlier I already created a 
fs-concept-nest5.dita file. So it did exist in this new folder.

What am I missing?

..dan