“/ENG” – Limit by Language
•? S S3 OR S6
•             116  S3
•             138  S6
•      S7     138  S3 OR S6
•?S S7/ENG
•>>>Term "ENG" is not defined in file 1 and is ignored
•      S8     138  S7/ENG
•?
•                                 http://library.dialog.com/bluesheets/html/bl0001.html
•
This is a Dialog system message that indicates that our limit command did not work
If you think over our search strategy, set S3 is indeed a subset of set S6.  Sets S6 and S7 would be considered equivalent sets.

The next thing that I tried was to limit my search to only English records.  This command works in a lot of DIALOG databases, but when it doesn’t work, the system indicates that the command is ignored.  If you look at the ERIC Bluesheet (link provided), and hone in on the section of the Bluesheet that discusses Limits, you’ll find no mention of a limit for English language materials.  Thankfully there’s another way to handle the problem.  Here’s a mind bender!  DIALOG will let you search multiple files together.  What happens when one file accepts the “/ENG” limit and others don’t?  Well, sometimes the search gets a little messy.  Preplanning your search is the only good remedy.