From: mike <mike>
Date: Wed, 27 Jun 2007 23:36:19 +0000 (+0000)
Subject: New
X-Git-Tag: v1.5~108
X-Git-Url: http://sru.miketaylor.org.uk/cgi-bin?a=commitdiff_plain;h=67217ccb1fdbaf3d931c6869bcd84397b1a78ac2;p=cql-java-moved-to-github.git

New
---

diff --git a/spec/bnf b/spec/bnf
new file mode 100644
index 0000000..616fa07
--- /dev/null
+++ b/spec/bnf
@@ -0,0 +1,21 @@
+$Id: bnf,v 1.1 2007-06-27 23:36:19 mike Exp $
+
+Sort of derived from http://www.loc.gov/standards/sru/cql/
+
+cqlQuery ::= prefixAssignment cqlQuery | scopedClause
+prefixAssignment ::= '>' prefix '=' uri | '>' uri
+scopedClause ::= scopedClause booleanGroup searchClause | searchClause
+booleanGroup ::= boolean [modifierList]
+boolean ::= 'and' | 'or' | 'not' | 'prox'
+searchClause ::= '(' cqlQuery ')'
+	       | index relation searchTerm
+	       | searchTerm
+relation ::= comparitor [modifierList]
+comparitor ::= comparitorSymbol | namedComparitor
+comparitorSymbol ::= '=' | '>' | '<' | '>=' | '<=' | '<>'
+namedComparitor ::= identifier
+modifierList ::= modifierList modifier | modifier
+modifier ::= '/' modifierName [comparitorSymbol modifierValue]
+prefix, uri, modifierName, modifierValue, searchTerm, index ::= term
+term ::= identifier | 'and' | 'or' | 'not' | 'prox'
+identifier ::= charString1 | charString2