Printing chinese character in PDF file

[Haines Brown]

I am working with a document in which a series of Chinese charaters is 
pasted. Emacs has no problem with them. 

I then lualatex construct from it a PDF file. Three of the characters 
appear in it but not one (义, hex 4E49). The code \symbol{"4E49} 
appears in the PDF as �, whether the PDF is displayed with atril or 
xpdf. Albatross tells me that the BabelStone Han font has the glyph, 
but that does not help in this case.

If one is prepareing a PDF for publication, how does one work around 
this?
-- 

     Haines Brown