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/*******************************************************************************
* Copyright (c) 2010-2017, Zoltan Ujhelyi, IncQuery Labs Ltd.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.matchers.psystem.queries;
/**
* @author Zoltan Ujhelyi
* @since 2.0
*
*/
public enum PVisibility {
/**
* A public (default) visibility means a pattern can be called at any time.
*/
PUBLIC,
/**
* A private query is not expected to be called directly, only by a different query matcher.
*/
PRIVATE,
/**
* A query that is only used inside a single caller query and is not visible outside its container query. Such
* patterns must also fulfill the following additional constraints:
*
* <ul>
* <li>An embedded query must have only a single body.</li>
* <li>An embedded query must not be recursice.</li>
* </ul>
*/
EMBEDDED
}
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