Introduced new prefix query features.

[yaz-moved-to-github.git] / README

diff --git a/README b/README
index 3149ec5..5079588 100644 (file)
--- a/README
+++ b/README
@@ -33,6 +33,27 @@ client osi:0103/find2.denet.dk:4500
 
 Use '?' to get a list of the available commands.
 
 
 Use '?' to get a list of the available commands.
 

+The current query language is a bit awkward, but functional:
+
+query    ::= ['@attrset' <attribute-set>] rpn
+rpn      ::= complex | simple | attr rpn
+complex  ::= operator rpn rpn
+operator ::= '@and' | '@or' | '@not'.
+simple   ::= term | set.
+term     ::= <word> | '"' <term> ... '"'.
+set      ::= '@set' <setname>.
+attr     ::= '@attr' [<attribute-set>] <number> '=' <number>.
+
+Eg.:
+
+Andersen
+
+"Hans Andersen"
+
+@and @attr 1=1 andersen @attr 1=4 @attr 4=2 duckling
+
+@attrset Bib-1 @and @attr GILS 2=2008 Washington @attr 1=21 weather
+

 The directories:
 
 doc     - Documentation.
 The directories:
 
 doc     - Documentation.

@@ -51,7 +72,7 @@ asn     - This module implements the Z39.50/SR protocol. The best way
        which defines structure and type definitions for each of the
        types introduced in the protocol specification.
 
        which defines structure and type definitions for each of the
        types introduced in the protocol specification.
 

-yazlib  - This module implements the transport transparency
+comstack- This module implements the transport transparency

        stack (COMSTACK). The comstack implements a generic interface
        for exchanging BER-encoded records over a network. It supports
        the 'American' mode of exchanging the records straight over
        stack (COMSTACK). The comstack implements a generic interface
        for exchanging BER-encoded records over a network. It supports
        the 'American' mode of exchanging the records straight over