1. IMHO it’s unlikely, that the title of the RSS will be $modx->documentObject[’pagetitle’]. For example, when I create document called RSS I will see my feed as "RSS" in my RSS reader (next to for example "Webmaster Central Blog", "UIE Brain Sparks", "Shotgun Marketing BLOG" etc...). There should be something like server name or a new parameter....
2. What about removing the <author>...</author> element? The problem is, that validator doesn’t like it, unles a well-formed e-mail adress is specified inside. Who would do this in these spammy days...
1. Eh? The simple solution is to change the pagetitle of your RSS document to whatever you want. You may potentially have multiple RSS documents. You should bear in mind that the "template" for the RSS feed doesn’t prefix or suffix the site name like your other webpages do.
2. Please tell me what validator you are using.
He is most likely using feedvalidator.org.
1. I agree with Paul.
2. The author tag is required to make a feed valid (at least according to the RSS 2.0 spec sheet I was reading)