1 files changed, 37 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/psystem/queries/PVisibility.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/psystem/queries/PVisibility.java
new file mode 100644
index 00000000..7cb312bd
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/psystem/queries/PVisibility.java
@@ -0,0 +1,37 @@
+/*******************************************************************************
+ * 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
+
+}