Modified RecordsFactory to allow passing source data as InputStream, …

[carenini]

…instead of reading them from file or from remote url.

RecordsFactory can accept a Map<named_stream,InputStream>, where named_stream has the format "label://sourcename" and match with the source value in the mapping file.

This way the RML mapper works accepting a mapping file plus a map of named inputs, and can work with in-memory data instead of fetching from pre-defined file/url locations.

[pheyvaer]

Hi @carenini

We understand the need to support InputStreams directly, but we advice against encoding that information directly in rml:source with something like label://sourcename, because the semantics are limited. I know that we also use rml:source for local files and remote files, but we are also looking into improving the description in those cases.