ColdFusion cffeed/cfoutput

Question

I'm currently using a combination of cffeed and cfoutput to generate an XLM/RSS feed, but am getting some curious output, which manifest differently with different browser settings(I think).

The ColdFusion code that produces the XML is

<cfset RssDetails= StructNew()>
<cfset RssDetails.version = "rss_2.0">
<cfset RssDetails.title = #someTitle#>
<cfset RssDetails.link = "someLink#">
<cfset RssDetails.description = #someDetails#>
<cfset RssDetails.pubDate = now()>
<cfset RssDetails.item = ArrayNew(1)>

<cfloop query="queryResults">
    <cfset RssDetails.item[currentRow] = structNew()>
    <cfset RssDetails.item[currentRow].title = #someResultTitle#>
    <cfset RssDetails.item[currentRow].description = structNew()>
    <cfset RssDetails.item[currentRow].description.value = #someResultData#>
    <cfset RssDetails.item[currentRow].link = "someResultLink#">
</cfloop>

<cffeed action="create" name="#RssDetails#" overwrite="true" xmlVar="someXML">

<cfoutput>#someXML#</cfoutput>

The basic output looks fine in a browser window, but if I then 'View Source' then there's several lines of 'whitespace' that are before and after the main body of XML. The format of the 'whitespace' when observed in 'View Source' is:

As mentioned above, the erroneous/additional output seems to vary with browser settings, although I've not worked out which ones yet, but ultimately, I'd like to remove the whitespace from the CF-generated XML, rather than rely on browser settings.

I've tried a couple of additional options in the cffeed command, but can't seem to hit a successful outcome...grateful for any thoughts or questions,

Phil