Is it possible to aggregate data from third party websites using RDFa? If so, how?

I am doing research for a university project and I am looking into aggregating data via RDFa, or even Linked Data. I have spent a couple days reading up on this, but I can’t seem to find a definite source that explains why and how this can be done. Has anyone here done this before or knows something about this topic?

I appreciate any information at all.

Merry Christmas!

Not particularly familiar with either data format, but I’d think you’d hit it about the same way you go about any data gathering and normalization project – think about the expected outcome, figure out what you can grab and ponder how to manage aggregation and information retrieval. What the data contains is vastly more important than format at the end of the day.