Changing template for a page based on a url parameter

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Hi,

I have the following requirement:

I need to change the template of a page based on a url parameter. I tried the <rn:condition> to change the template attribute on the meta tag based on the url parameter check.

But the last meta tag was getting rendered. Using the pre_page_render, we can only set the theme.

Any Ideas on this?

Thanks,

Nithin