Github user ejwhite922 commented on a diff in the pull request:
https://github.com/apache/incubator-rya/pull/218#discussion_r135878109
--- Diff:
sail/src/main/java/org/apache/rya/rdftriplestore/inference/ReflexivePropertyVisitor.java
---
@@ -0,0 +1,73 @@
+package org.apache.rya.rdftriplestore.inference;
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+
+import org.apache.rya.api.RdfCloudTripleStoreConfiguration;
+import org.openrdf.model.URI;
+import org.openrdf.query.algebra.StatementPattern;
+import org.openrdf.query.algebra.Var;
+import org.openrdf.query.algebra.ZeroLengthPath;
+
+/**
+ * Expands the query tree to account for any relevant reflexive properties
+ * known to the {@link InferenceEngine}.
+ *
+ * A reflexive property is a property for which any node can be inferred
to have
+ * reflexively: If :p is a reflexive property, then <?x :p ?x> is true for
all ?x.
+ *
+ * Applies to any statement pattern whose predicate is defined (not a
variable)
+ * and is a reflexive property according to the InferenceEngine. If the
property
+ * is reflexive, then the statement pattern should match when the subject
equals
+ * the object. Therefore, replace the statement pattern with a union of
itself
+ * and a ZeroLengthPath between the subject and object. This union is
similar to
+ * the ZerOrOnePath property path expression in SPARQL: <?x :p? ?y>
matches if
--- End diff --
typo. ZeroOrOnePath
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