Prefix NLRI of BGP-ls

Hi, Experts,

I made a simple test to export the TED to lsdist.0, only Nodes and Links NLRIs can be found in lsdist.0, no Prefix NLRI in there. I purposely exported an external route into ISIS, and confirmed that routes can be found in the routing table on the BGP-ls router, but question is how to trancode this kind of routes into lsdist.0?

I also noticed the logic here is ISIS --> TED --> lsdist.0, the external IGP routes seems can't be imported from IGP database into TE database, so that's explain why no Prefix NLRI in lsdist.0.  Please correct me if anything i'm wrong. 

Thanks!