2 package org.z3950.zing.cql;
6 * Exception indicating that a relation was not recognised.
7 * At compilation time, we accept any syntactically valid relation;
8 * but when rendering a tree out as PQF, we need to translate the
9 * relations into sets of Type-1 query attributes. If we can't do
10 * that, because the PQF configuration doesn't know about a relation,
11 * we throw one of these babies.
14 public class UnknownRelationException extends PQFTranslationException {
16 * Creates a new <TT>UnknownRelationException</TT>.
18 * The relation for which there was no PQF configuration.
20 public UnknownRelationException(String s) {