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 // Copyright 2008 The Apache Software Foundation
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry5.corelib.data;

Used with the org.apache.tapestry5.corelib.components.Select component to control whether an initial blank option is supplied. Determines the optionality of the undelrying property from the Select's org.apache.tapestry5.FieldValidator.isRequired()
public enum BlankOption
{
    
Always include the blank option, even if the underlying property is required.
    ALWAYS,

    
Never include the blank option, even if the underlying property is optional.
    NEVER,

    
The default: include the blank option if the underlying property is optional.
    AUTO;
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