Fix: Encoding the path

src/Metadata.Tests/MetadataTests.cs

 using Coscine.Configuration;
 using Coscine.Metadata.Util;
-using Microsoft.EntityFrameworkCore.Metadata;
-using Microsoft.EntityFrameworkCore.Metadata.Internal;
 using NUnit.Framework;
 using NUnit.Framework.Internal;
 using System;
 using System.Linq;
-using System.Text;
 using VDS.RDF;
 using VDS.RDF.Parsing;
 

src/Metadata/MetadataRdfStoreConnector.cs

@@ -7,6 +7,7 @@ using VDS.RDF.Parsing;
 using VDS.RDF.Query;
 using VDS.RDF;
 using System.Threading.Tasks;
+using System.Web;
 
 namespace Coscine.Metadata
 {
@@ -48,7 +49,7 @@ namespace Coscine.Metadata
         public List<string> GetDataIds(string? resourceId = null, string? path = null, bool extracted = false, bool includeInvalidated = false)
         {
             var resourceGraphUri = $"https://purl.org/coscine/resources/{resourceId}";
-            var pathGraphUri = path != null ? $"{resourceGraphUri}/{(path.StartsWith("/") ? path[1..] : path)}/" : "";
+            var pathGraphUri = path != null ? $"{resourceGraphUri}/{HttpUtility.UrlPathEncode(path.StartsWith("/") ? path[1..] : path)}/" : "";
 
             var query = $@"{{ 
                 " + ((resourceId != null) ? $"@resource <{Uris.DcatCatalog}>* ?g ." : "") + $@"
@@ -129,7 +130,7 @@ namespace Coscine.Metadata
         public List<string> GetMetadataIds(string? resourceId = null, string? path = null, bool extracted = false)
         {
             var resourceGraphUri = $"https://purl.org/coscine/resources/{resourceId}";
-            var pathGraphUri = path != null ? $"{resourceGraphUri}/{(path.StartsWith("/") ? path[1..] : path)}/" : "";
+            var pathGraphUri = path != null ? $"{resourceGraphUri}/{HttpUtility.UrlPathEncode(path.StartsWith("/") ? path[1..] : path)}/" : "";
 
             var query = $@"{{ 
                 " + ((resourceId != null) ? $"@resource <{Uris.DcatCatalog}>* ?g ." : "") + $@"