src/Metadata/Controllers/MetadataController.cs

 using Coscine.Action;
 using Coscine.Action.EventArgs;
 using Coscine.Api.Metadata.ParameterObjects;
+using Coscine.Api.Metadata.Util;
 using Coscine.ApiCommons;
 using Coscine.Configuration;
 using Coscine.Database.Models;
@@ -19,6 +20,7 @@ using System.Net;
 using System.Threading.Tasks;
 using System.Web;
 using VDS.RDF;
+using VDS.RDF.Parsing;
 using VDS.RDF.Writing;
 
 namespace Coscine.Api.Metadata.Controllers
@@ -215,6 +217,10 @@ namespace Coscine.Api.Metadata.Controllers
                 return BadRequest("The mime type has to be text/turtle");
             }
 
+            var graph = new Graph();
+            graph.LoadFromString(applicationProfile.Definition, new TurtleParser());
+            graph.BaseUri = new CustomUri(applicationProfile.BaseURL);
+
             await gitLabClient.Branches.CreateAsync(ApplicationProfileProjectURL, new CreateBranchRequest(newBranchName, "master"));
 
             var folderName = applicationProfile.BaseURL.Replace(ApplicationProfileUrl, "");
@@ -223,12 +229,14 @@ namespace Coscine.Api.Metadata.Controllers
                 folderName = folderName[..(folderName.Length - 1)];
             }
 
+            var serialization = StringWriter.Write(graph, new CompressingTurtleWriter());
+
             var actions = new List<CreateCommitRequestAction>
             {
                 new CreateCommitRequestAction(
                     new CreateCommitRequestActionType(),
                     $"profiles/{folderName}/index.ttl") {
-                        Content = applicationProfile.Definition
+                        Content = serialization
                     }
             };
 

src/Metadata/Metadata.csproj

@@ -5,7 +5,7 @@
 		<AssemblyName>Coscine.Api.Metadata</AssemblyName>
 		<GenerateDocumentationFile>true</GenerateDocumentationFile>
 		<TargetFramework>net5.0</TargetFramework>
-		<Version>3.0.0</Version>
+		<Version>3.0.1</Version>
 	</PropertyGroup>
 	<PropertyGroup>
 		<Authors>RWTH Aachen University</Authors>

src/Metadata/Util/CustomUri.cs

+using System;
+
+namespace Coscine.Api.Metadata.Util
+{
+    /// <summary>
+    /// Adapts the returned ToString of a Uri
+    /// </summary>
+    public class CustomUri : Uri
+    {
+        /// <summary>
+        /// Constructs a Custom Uri
+        /// </summary>
+        /// <param name="uri"></param>
+        public CustomUri(string uri) : base(uri)
+        {
+
+        }
+
+        /// <summary>
+        /// Overwrites the ToString for returning the AbsoluteUri (for dotNetRDF)
+        /// </summary>
+        /// <returns></returns>
+        public override string ToString()
+        {
+            return AbsoluteUri;
+        }
+    }
+}
\ No newline at end of file