Fix javadoc.

git-svn-id: https://olap4j.svn.sourceforge.net/svnroot/olap4j/trunk@317 c6a108a4-781c-0410-a6c6-c2d559e19af0

src/org/olap4j/PreparedOlapStatement.java

@@ -97,15 +97,17 @@ public interface PreparedOlapStatement
  /**
  * Returns whether the value of the designated parameter is set.
  *
- * <p>To set the value call one of the {@link #setInt setXxx} methods. To
+ * <p>Note that you cannot tell whether the parameter is set by looking to
+ * see whether the value is {@code null}, because {@code null} is a valid
+ * parameter value. When a parameter is not set, its value is derived by
+ * evaluating its default expression.
+ *
+ * <p>To set the value call one of the {@link #setObject setXxx} methods. To
  * unset the value, call {@link #unset}.
  *
  * @param parameterIndex the first parameter is 1, the second is 2, ...
  * @return whether the parameter's value has been set
- * <code>ParameterMetaData.parameterNoNulls</code>,
- * <code>ParameterMetaData.parameterNullable</code>, or
- * <code>ParameterMetaData.parameterNullableUnknown</code>
- * @exception java.sql.SQLException if a database access error occurs
+ * @exception java.sql.SQLException if a database access error occurs
  */
  boolean isSet(int parameterIndex) throws SQLException;
 
@@ -115,7 +117,7 @@ public interface PreparedOlapStatement
  * @see #isSet(int)
  *
  * @param parameterIndex the first parameter is 1, the second is 2, ...
- * @exception java.sql.SQLException if a database access error occurs
+  * @exception java.sql.SQLException if a database access error occurs
  */
  void unset(int parameterIndex) throws SQLException;
 }