diff --git a/common/common/src/main/java/dev/enola/common/io/resource/EmptyResource.java b/common/common/src/main/java/dev/enola/common/io/resource/EmptyResource.java
index 3dcf44ccd..ae161a316 100644
--- a/common/common/src/main/java/dev/enola/common/io/resource/EmptyResource.java
+++ b/common/common/src/main/java/dev/enola/common/io/resource/EmptyResource.java
@@ -34,15 +34,14 @@ public class EmptyResource implements ReadableResource {
     // TODO Perhaps rename this to VoidResource with void:/ URI?
 
     static final String SCHEME = "empty";
-
+    private static final URI EMPTY_URI = URI.create(SCHEME + ":?");
     private final MediaType mediaType;
 
     private final URI uri;
 
     public EmptyResource(MediaType mediaType) {
         this.mediaType = mediaType;
-        // TODO Why withoutParameters()? Remove!
-        this.uri = URI.create(SCHEME + ":" + mediaType.withoutParameters());
+        this.uri = URIs.addMediaType(EMPTY_URI, mediaType);
     }
 
     @Override
diff --git a/common/common/src/main/java/dev/enola/common/io/resource/URIs.java b/common/common/src/main/java/dev/enola/common/io/resource/URIs.java
index b84f3813b..079ebf119 100644
--- a/common/common/src/main/java/dev/enola/common/io/resource/URIs.java
+++ b/common/common/src/main/java/dev/enola/common/io/resource/URIs.java
@@ -63,13 +63,20 @@ public static URI addMediaType(URI uri, MediaType mediaType) {
     }
 
     private static URI addQueryParameter(URI uri, String key, String value) {
+        String connector;
         if (uri.getQuery() != null && uri.getQuery().contains(key)) {
             return uri;
         } else if (uri.getQuery() == null) {
-            return URI.create(uri.toString() + "?" + key + "=" + encodeQueryParameterValue(value));
+            if (!uri.getSchemeSpecificPart().contains("?")) {
+                connector = "?";
+            } else {
+                // Special case of "scheme:?"-like URIs with "empty" query
+                connector = "";
+            }
         } else {
-            return URI.create(uri.toString() + "&" + key + "=" + encodeQueryParameterValue(value));
+            connector = "&";
         }
+        return URI.create(uri + connector + key + "=" + encodeQueryParameterValue(value));
     }
 
     private static String encodeQueryParameterValue(String value) {
diff --git a/common/common/src/test/java/dev/enola/common/io/resource/EmptyResourceTest.java b/common/common/src/test/java/dev/enola/common/io/resource/EmptyResourceTest.java
index f7d01f38b..7b421ae66 100644
--- a/common/common/src/test/java/dev/enola/common/io/resource/EmptyResourceTest.java
+++ b/common/common/src/test/java/dev/enola/common/io/resource/EmptyResourceTest.java
@@ -24,6 +24,7 @@
 import org.junit.Test;
 
 import java.io.IOException;
+import java.net.URI;
 
 public class EmptyResourceTest {
     @Test
@@ -32,6 +33,7 @@ public void testEmptyResource() throws IOException {
         assertThat(e.byteSource().isEmpty()).isTrue();
         assertThat(e.charSource().isEmpty()).isTrue();
         assertThat(e.mediaType()).isEqualTo(YamlMediaType.YAML_UTF_8);
-        assertThat(e.uri().toString()).isEqualTo("empty:application/yaml");
+        assertThat(e.uri())
+                .isEqualTo(URI.create("empty:?mediaType=application%2Fyaml%3Bcharset%3Dutf-8"));
     }
 }
diff --git a/common/common/src/test/java/dev/enola/common/io/resource/URIsTest.java b/common/common/src/test/java/dev/enola/common/io/resource/URIsTest.java
index fade3197c..670f1f46c 100644
--- a/common/common/src/test/java/dev/enola/common/io/resource/URIsTest.java
+++ b/common/common/src/test/java/dev/enola/common/io/resource/URIsTest.java
@@ -84,6 +84,10 @@ public void testAddMediaType() throws URISyntaxException {
         var uri2expected = URI.create("scheme:something?mediaType=text%2Fplain%3Bcharset%3Dutf-8");
         assertThat(uri2).isEqualTo(uri2expected);
         assertThat(URIs.getMediaType(uri2expected)).isEqualTo(mt2);
+
+        var uri3 = URIs.addMediaType(URI.create("scheme:?"), mt1);
+        var uri3expected = URI.create("scheme:?mediaType=image%2Fgif");
+        assertThat(uri3).isEqualTo(uri3expected);
     }
 
     @Test
diff --git a/docs/use/list/index.md b/docs/use/list/index.md
index 18bcd7408..e9d25f39a 100644
--- a/docs/use/list/index.md
+++ b/docs/use/list/index.md
@@ -47,7 +47,7 @@ Note how the section above showed some additional entity kinds, in addition to t
 It's possible to list only those built-in entity kinds, using an "empty" model URI, like this:
 
 ```bash cd .././.././..
-$ ./enola list --model empty:application/json enola.entity_kind
+$ ./enola list --model "empty:?mediaType=application/json" enola.entity_kind
 ...
 ```
 
diff --git a/docs/use/list/schema.md b/docs/use/list/schema.md
index 1470d591f..54c4a4152 100644
--- a/docs/use/list/schema.md
+++ b/docs/use/list/schema.md
@@ -21,6 +21,6 @@
 Because the "schemas" are internally Entities (of _Kind_ `enola.schema`), they can also [be listed](index.md):
 
 ```bash cd .././.././..
-$ ./enola list --model empty:application/json --format=yaml enola.schema
+$ ./enola list --model "empty:?mediaType=application/json" --format=yaml enola.schema
 ...
 ```