can any one please let me know the main difference between <pubDate> and <dc:date> in feed's structure. also please explain
<dc:date>
<dc:creator>
<dc:....>
<dc:....>
will those be required for building feeds?
According to this page (from the internet archive):
So, let me get this straight. RFC2822 is the format used by the pubDate element in RSS 2.0, and looks like this: Fri, 21 Nov 1997 09:55:06 -0600
ISO8601 is used in the dc:date element in RSS 1.0 (and sometimes RSS 2.0) and looks like this: 1998-05-12T14:15:00
The difference is in the format. Both define the same thing.
This post (from the internet archive) has an explanation of the <dc:creator> tag and how it differs from the <author> tag:
Therefore, if you are only using the name of the author in an RSS item make sure to use the
<dc:creator>tag and not the<author>tag
The RSS standard is flexible enough for you to miss out some information, but some readers might object if there is, say, a date missing which is useful for ordering the items. Personally, I'd include the date and author and be consistent about which form I used.