displayTeaserStandard, dmHTML and SEO

Hi All,
I might be using some deprecated stuff here but I got heckled by my SEO 
about duplicate URLS for content, namely dmHTML. This came about because if 
I have a teaser to an HTML page it has a different url to the navigation eg 
/about-us (dmNavigation) & /about-us/about-us (dmHTML).
I can of course put the following is the header: 
<link rel="canonical" href="http://www.mydomain.co.nz/about-us<http://www.hirepool.co.nz/vehicle-rental>
"/>

eg
<cfif lcase(stobj.typename) EQ 'dmhtml'>
    <skin:buildLink objectID="#request.navid#" r_url="theURL"/>     
    <cfoutput><link rel="canonical" href="http://#cgi.SERVER_NAME##theURL#"
/></cfoutput> 
</cfif>
 

But best practice is to try and avoid (or at least referencing) the 
additional URL to start with.
It doesn't look like skin:buildLink has any option that looks for a navid 
for a content type.

My initial reaction is to put 
<cfset theNavId = application.fapi.getContentType("#stobj.typename#").
getNavID(objectid="#stobj.objectid#", typename="#stobj.typename#", stobject=
"#stobj#") /> 
into the teasers webskins for dmHTML and use the theNavId instead of the 
objectid for all the buildLinks.

Does anyone have any thoughts on the matter? Better way of doing it?

Regards
Phil





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