Is there any documentation on how to use the cd\_dynamic\_conf.xml?

There's the [online reference](http://sdllivecontent.sdl.com/LiveContent/web/pub.xql?action=home&pub=SDL_Tridion_2011_SPONE&lang=en-US#docid=reference_51F0101F6A114F318267FE7F1B5133FD&addHistory=true&query=&scope=&tid=&filename=CDConfigRef_DCD.xml&resource=&inner_id=&eventType=lcContent.loadDocreference_51F0101F6A114F318267FE7F1B5133FD&url=/LiveContent/web/search.xql?c=t&pub=SDL_Tridion_2011_SPONE&lang=en-US&action=search&query=URLMappings&sid=lcSearch.runSearch1403089531847&currentQuery=URLMappings&currentScope=), but nothing describing usage and why you might need/want to use it.

StaticMappings nodes appear to be straight forward enough - dynamic links can be generated as absolute URLs not relative ones using the Host node information.

The StorageMapping node is a little less clear - is the IdentifyPublicationByProperty an enumeration, what other value can it be and why would you change it?