diff --git a/modules/lib/api.json b/modules/lib/api.json
index 4909cc51..b1d21997 100644
--- a/modules/lib/api.json
+++ b/modules/lib/api.json
@@ -1299,6 +1299,16 @@
 							"type": "string"
 						}
 					},
+					{
+						"name": "serialize",
+						"in": "query",
+						"schema": {
+							"type": "string",
+							"enum": ["xml", "html5"],
+							"default": "html5"
+						},
+						"description": "should HTML content be rendered as HTML5 or XML?"
+					},
 					{
 						"name": "If-Modified-Since",
 						"in": "header",
@@ -3421,7 +3431,26 @@
                     }
                 }
             }
-        }
+        },
+		"/sitemap.xml": {
+			"get": {
+				"description": "Return generated sitemap",
+				"operationId": "sitemap:sitemap",
+				"parameters": [],
+				"responses": {
+					"200": {
+						"description": "OK",
+						"content": {
+							"application/xml": {
+								"schema": {
+									"type": "string"
+								}
+							}
+						}
+					}
+				}
+			}
+		}
     },
 	"security": [
 		{
diff --git a/modules/lib/api/document.xql b/modules/lib/api/document.xql
index 91b92f9a..8d211d36 100644
--- a/modules/lib/api/document.xql
+++ b/modules/lib/api/document.xql
@@ -522,12 +522,14 @@ declare function dapi:get-fragment($request as map(*), $docs as node()*, $path a
                                 "content": serialize($transformed?content,
                                     <output:serialization-parameters xmlns:output="http://www.w3.org/2010/xslt-xquery-serialization">
                                     <output:indent>no</output:indent>
-                                    <output:method>html5</output:method>
+                                    <output:method>{$request?parameters?serialize}</output:method>
+                                    <output:omit-xml-declaration>yes</output:omit-xml-declaration>
                                         </output:serialization-parameters>),
                                 "footnotes": serialize($transformed?footnotes,
                                     <output:serialization-parameters xmlns:output="http://www.w3.org/2010/xslt-xquery-serialization">
                                         <output:indent>no</output:indent>
-                                        <output:method>html5</output:method>
+                                        <output:method>{$request?parameters?serialize}</output:method>
+                                        <output:omit-xml-declaration>yes</output:omit-xml-declaration>
                                     </output:serialization-parameters>
                                 ),
                                 "userParams": $userParams,