version 0.0-6
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 * All metadata handling is streamlined in the metadata function, 
 which now returns a data.frame (actually a data.table) instead of a list,
 and includes the metadata from both Phylo-WS and OAI-MPH interfaces.  



version 0.0-5
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 * Improved error handling
 * Will allow multiple attempts if fails to access resource
 * Search now supports query by doi
 * updated caches
 * outdated demos removed