[NTG-context] How do I use entities in DocBook in ConTeXt

Although I use emacs as a text editor, I'm not confident in using utf-8 encodings. So if I can I'd prefer to use entities for the characters not defined in ASCII. How can I define entities such as "“" (for the left double quotation character) and "”" (for the right double quotation character) so as the context-processor can process them.