X-Git-Url: http://jsfdemo.indexdata.com/?a=blobdiff_plain;f=src%2Forg%2Fz3950%2Fzing%2Fcql%2FCQLNode.java;h=eab6db40f12af4f582b47d0f3d870bedc7a9077d;hb=fc82b225d39cc66cb85c2557db0c0d4a4c5a6e27;hp=24a2d2746965ba0e32f6fff7e8ac572668c534ab;hpb=26e8603c0e0d457f31a2231cb660caed14263364;p=cql-java-moved-to-github.git

diff --git a/src/org/z3950/zing/cql/CQLNode.java b/src/org/z3950/zing/cql/CQLNode.java
index 24a2d27..eab6db4 100644
--- a/src/org/z3950/zing/cql/CQLNode.java
+++ b/src/org/z3950/zing/cql/CQLNode.java
@@ -1,4 +1,4 @@
-// $Id: CQLNode.java,v 1.11 2002-11-06 00:05:58 mike Exp $
+// $Id: CQLNode.java,v 1.12 2002-11-06 20:13:45 mike Exp $
 
 package org.z3950.zing.cql;
 import java.util.Properties;
@@ -7,7 +7,7 @@ import java.util.Properties;
 /**
  * Represents a node in a CQL parse-tree.
  *
- * @version	$Id: CQLNode.java,v 1.11 2002-11-06 00:05:58 mike Exp $
+ * @version	$Id: CQLNode.java,v 1.12 2002-11-06 20:13:45 mike Exp $
  */
 public abstract class CQLNode {
     CQLNode() {}		// prevent javadoc from documenting this
@@ -39,13 +39,32 @@ public abstract class CQLNode {
     /**
      * Renders a parse-tree into a Yaz-style PQF string.
      * <P>
+     * <PRE>
+	query ::= top-set query-struct.
+	top-set ::= [ '@attrset' string ]
+	query-struct ::= attr-spec | simple | complex | '@term' term-type
+	attr-spec ::= '@attr' [ string ] string query-struct
+	complex ::= operator query-struct query-struct.
+	operator ::= '@and' | '@or' | '@not' | '@prox' proximity.
+	simple ::= result-set | term.
+	result-set ::= '@set' string.
+	term ::= string.
+	proximity ::= exclusion distance ordered relation which-code unit-code.
+	exclusion ::= '1' | '0' | 'void'.
+	distance ::= integer.
+	ordered ::= '1' | '0'.
+	relation ::= integer.
+	which-code ::= 'known' | 'private' | integer.
+	unit-code ::= integer.
+	term-type ::= 'general' | 'numeric' | 'string' | 'oid' | 'datetime' | 'null'.
+     * </PRE>
      * @return
      *	A String containing a PQF query equivalent to the parse-tree
      *	whose root is this node.  This may be fed into the tool of
      *	your choice to obtain a BER-encoded packet.
      */
     abstract public String toPQF(Properties config)
-	throws UnknownQualifierException, UnknownRelationException;
+	throws PQFTranslationException;
 
     /**
      * Returns a String of spaces for indenting to the specified level.