I just discovered a scant reference to this on the ToolSyntax page, and tracked 
it down to something that looks like it was introduced around 2011:  a 

changeset:   8553b02ce9ee
user:        kanwei
date:        2011-07-19 03:56:23
summary:     Tools: Add new LibraryDataset tool parameter to expose LDDAs to 
tools. Use trackster's modal popup interface for item selection. Add new 
InputWrapper that exposes LDDA templates as well.

Now I can't quite fathom the syntax around this but it appears to be broken - 
python error displayed:

TypeError: get_initial_value() got an unexpected keyword argument 'history'

Which is because in the galaxy code the 
   def get_initial_value( self, trans, context ) 

function is missing a "history=None" parameter like other types have?!

But is this input type essentially discontinued (no other refs to it on the 
web) or is it supposed to be operational?

I was hoping for a tool input that would list a particular libraries datasets, 
so that I could obtain their file paths for use in my tool.

<param name="test" type="library_data" label="test" help="test help"/>
   <options library="Reference Bins">



Hsiao lab, BC Public Health Microbiology & Reference Laboratory, BC Centre for 
Disease Control
655 West 12th Avenue, Vancouver, British Columbia, V5Z 4R4 Canada
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