Flickr: Tags , Sets and Virtual Sets

I'm a big fan of flickr, and have been a little confused between Tags and
Sets. In a nutshell here is the difference:

• Sets - a container for pictures ( a picture can be in multiple sets)
• Tags - a property of a picture ( a picture can have multiple tags)

This is a weird model. Ideally, you'd be able to make virtual sets from tag
combinations and date ranges. Unfortunately flickr doesn't have this
ability. But what flicker does have is an external API set.

Using this API set I'm working on a tool to make virtual sets from tags.

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