chore: import upstream snapshot with attribution

libnd4j/include/graph/scheme/properties.fbs

@@ -0,0 +1,35 @@
+/* ******************************************************************************
+ *
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License, Version 2.0 which is available at
+ * https://www.apache.org/licenses/LICENSE-2.0.
+ *
+ *  See the NOTICE file distributed with this work for additional
+ *  information regarding copyright ownership.
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ ******************************************************************************/
+
+include "array.fbs";
+
+namespace graph;
+
+
+table FlatProperties {
+    name:string;    // name of this property
+    i:[int];        // integer properties
+    l:[long];       // long properties
+    d:[double];     // double properties
+    a:[FlatArray];  // array properties
+    b:[bool];       // boolean properties
+    s:[string];     // string properties
+    shape:[int];    // array shape (for i/l/d/a/b/s). Used when encoding arrays as a 1d. Null when ildabs fields are used as length 1 for primitives/non-arrays
+}
+
+root_type FlatProperties;