Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/Gml/SerializableEnvelope.cs
===================================================================
diff -u
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/Gml/SerializableEnvelope.cs	(revision 0)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/Gml/SerializableEnvelope.cs	(revision a3cd7fd4246c7b90ed5f1ce17a7a79aa64e2ff9a)
@@ -0,0 +1,72 @@
+// Copyright (C) Stichting Deltares 2017. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using System.Xml.Serialization;
+using Core.Common.Base.Geometry;
+
+namespace Ringtoets.AssemblyTool.IO.Model.Gml
+{
+    /// <summary>
+    /// Class containing the data describing a GML Envelope object
+    /// </summary>
+    public class SerializableEnvelope
+    {
+        /// <summary>
+        /// Creates a new instance of <see cref="SerializableEnvelope"/>.
+        /// </summary>
+        public SerializableEnvelope() {}
+
+        /// <summary>
+        /// Creates a new instance of <see cref="SerializableEnvelope"/>.
+        /// </summary>
+        /// <param name="lowerCorner">The lower corner of the envelope.</param>
+        /// <param name="upperCorner">The upper corner of the envelope.</param>
+        /// <exception cref="ArgumentNullException">Thrown when any parameter is <c>null</c>.</exception>
+        public SerializableEnvelope(Point2D lowerCorner, Point2D upperCorner)
+        {
+            if (lowerCorner == null)
+            {
+                throw new ArgumentNullException(nameof(lowerCorner));
+            }
+
+            if (upperCorner == null)
+            {
+                throw new ArgumentNullException(nameof(upperCorner));
+            }
+
+            LowerCorner = lowerCorner.X + " " + lowerCorner.Y;
+            UpperCorner = upperCorner.X + " " + upperCorner.Y;
+        }
+
+        /// <summary>
+        /// The coordinates of the lower corner of the envelope.
+        /// </summary>
+        [XmlElement(AssemblyXmlIdentifiers.LowerCorner, Namespace = AssemblyXmlIdentifiers.GmlNamespace)]
+        public string LowerCorner { get; set; }
+
+        /// <summary>
+        /// The coordinates of the upper corner of the envelope.
+        /// </summary>
+        [XmlElement(AssemblyXmlIdentifiers.UpperCorner, Namespace = AssemblyXmlIdentifiers.GmlNamespace)]
+        public string UpperCorner { get; set; }
+    }
+}
\ No newline at end of file
Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Ringtoets.AssemblyTool.IO.csproj
===================================================================
diff -u -r030608f6fe16d9b15edb1be2fb191526ae15a32c -ra3cd7fd4246c7b90ed5f1ce17a7a79aa64e2ff9a
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Ringtoets.AssemblyTool.IO.csproj	(.../Ringtoets.AssemblyTool.IO.csproj)	(revision 030608f6fe16d9b15edb1be2fb191526ae15a32c)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Ringtoets.AssemblyTool.IO.csproj	(.../Ringtoets.AssemblyTool.IO.csproj)	(revision a3cd7fd4246c7b90ed5f1ce17a7a79aa64e2ff9a)
@@ -16,6 +16,7 @@
     </None>
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Model\Gml\SerializableEnvelope.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
 </Project>
\ No newline at end of file
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/Gml/SerializableEnvelopeTest.cs
===================================================================
diff -u
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/Gml/SerializableEnvelopeTest.cs	(revision 0)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/Gml/SerializableEnvelopeTest.cs	(revision a3cd7fd4246c7b90ed5f1ce17a7a79aa64e2ff9a)
@@ -0,0 +1,92 @@
+// Copyright (C) Stichting Deltares 2017. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using Core.Common.Base.Geometry;
+using NUnit.Framework;
+using Ringtoets.AssemblyTool.IO.Model.Gml;
+using Ringtoets.AssemblyTool.IO.TestUtil;
+
+namespace Ringtoets.AssemblyTool.IO.Test.Model.Gml
+{
+    public class SerializableEnvelopeTest
+    {
+        [Test]
+        public void DefaultConstructor_ReturnsDefaultValues()
+        {
+            // Call
+            var boundaries = new SerializableEnvelope();
+
+            // Assert
+            Assert.IsNull(boundaries.LowerCorner);
+            Assert.IsNull(boundaries.UpperCorner);
+
+            SerializableAttributeTestHelper.AssertXmlElementAttribute<SerializableEnvelope>(
+                nameof(SerializableEnvelope.LowerCorner), "lowerCorner", "http://www.opengis.net/gml/3.2");
+            SerializableAttributeTestHelper.AssertXmlElementAttribute<SerializableEnvelope>(
+                nameof(SerializableEnvelope.UpperCorner), "upperCorner", "http://www.opengis.net/gml/3.2");
+        }
+
+        [Test]
+        public void Constructor_LowerCornerNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            var random = new Random(39);
+
+            // Call
+            TestDelegate call = () => new SerializableEnvelope(null, new Point2D(random.NextDouble(), random.NextDouble()));
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("lowerCorner", exception.ParamName);
+        }
+
+        [Test]
+        public void Constructor_UpperCornerNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            var random = new Random(39);
+
+            // Call
+            TestDelegate call = () => new SerializableEnvelope(new Point2D(random.NextDouble(), random.NextDouble()), null);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("upperCorner", exception.ParamName);
+        }
+
+        [Test]
+        public void Constructor_WithCorners_ReturnsExpectedValues()
+        {
+            // Setup
+            var random = new Random(39);
+            var lowerCorner = new Point2D(random.NextDouble(), random.NextDouble());
+            var upperCorner = new Point2D(random.NextDouble(), random.NextDouble());
+
+            // Call
+            var boundaries = new SerializableEnvelope(lowerCorner, upperCorner);
+
+            // Assert
+            Assert.AreEqual(lowerCorner.X + " " + lowerCorner.Y, boundaries.LowerCorner);
+            Assert.AreEqual(upperCorner.X + " " + upperCorner.Y, boundaries.UpperCorner);
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Ringtoets.AssemblyTool.IO.Test.csproj
===================================================================
diff -u -r030608f6fe16d9b15edb1be2fb191526ae15a32c -ra3cd7fd4246c7b90ed5f1ce17a7a79aa64e2ff9a
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Ringtoets.AssemblyTool.IO.Test.csproj	(.../Ringtoets.AssemblyTool.IO.Test.csproj)	(revision 030608f6fe16d9b15edb1be2fb191526ae15a32c)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Ringtoets.AssemblyTool.IO.Test.csproj	(.../Ringtoets.AssemblyTool.IO.Test.csproj)	(revision a3cd7fd4246c7b90ed5f1ce17a7a79aa64e2ff9a)
@@ -13,6 +13,7 @@
     <Reference Include="System" />
     <Reference Include="System.Core" />
   <ItemGroup>
+    <Compile Include="Model\Gml\SerializableEnvelopeTest.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>