diff --git a/core/polyfills.php b/core/polyfills.php
index 328ebca2..725abec3 100644
--- a/core/polyfills.php
+++ b/core/polyfills.php
@@ -190,8 +190,8 @@ function stream_file(string $file, int $start, int $end): void
     }
 }
 
-if (!function_exists('http_parse_headers')) { #http://www.php.net/manual/en/function.http-parse-headers.php#112917
-
+# http://www.php.net/manual/en/function.http-parse-headers.php#112917
+if (!function_exists('http_parse_headers')) {
     /**
      * #return string[]
      */
@@ -478,25 +478,6 @@ function clamp(?int $val, ?int $min=null, ?int $max=null): int
     return $val;
 }
 
-function xml_tag(string $name, array $attrs=[], array $children=[]): string
-{
-    $xml = "<$name ";
-    foreach ($attrs as $k => $v) {
-        $xv = str_replace('&#039;', '&apos;', htmlspecialchars((string)$v, ENT_QUOTES));
-        $xml .= "$k=\"$xv\" ";
-    }
-    if (count($children) > 0) {
-        $xml .= ">\n";
-        foreach ($children as $child) {
-            $xml .= xml_tag($child);
-        }
-        $xml .= "</$name>\n";
-    } else {
-        $xml .= "/>\n";
-    }
-    return $xml;
-}
-
 /**
  * Original PHP code by Chirp Internet: www.chirp.com.au
  * Please acknowledge use of this code by including this header.
diff --git a/core/tests/polyfills.test.php b/core/tests/polyfills.test.php
index 84c3eea0..ba5b6fcd 100644
--- a/core/tests/polyfills.test.php
+++ b/core/tests/polyfills.test.php
@@ -76,14 +76,6 @@ class PolyfillsTest extends TestCase
         $this->assertEquals(clamp(15, 5, 10), 10);
     }
 
-    public function test_xml_tag()
-    {
-        $this->assertEquals(
-            "<test foo=\"bar\" >\n<cake />\n</test>\n",
-            xml_tag("test", ["foo"=>"bar"], ["cake"])
-        );
-    }
-
     public function test_truncate()
     {
         $this->assertEquals(truncate("test words", 10), "test words");
diff --git a/ext/danbooru_api/main.php b/ext/danbooru_api/main.php
index df845532..51541a53 100644
--- a/ext/danbooru_api/main.php
+++ b/ext/danbooru_api/main.php
@@ -1,5 +1,12 @@
 <?php declare(strict_types=1);
 
+use \MicroHTML\HTMLElement;
+function TAGS(...$args) {return new HTMLElement("tags", $args);}
+function TAG(...$args) {return new HTMLElement("tag", $args);}
+function POSTS(...$args) {return new HTMLElement("posts", $args);}
+function POST(...$args) {return new HTMLElement("post", $args);}
+
+
 class DanbooruApi extends Extension
 {
     public function onPageRequest(PageRequestEvent $event)
@@ -14,10 +21,10 @@ class DanbooruApi extends Extension
                 $this->api_add_post();
             } elseif ($event->page_matches("api/danbooru/find_posts") || $event->page_matches("api/danbooru/post/index.xml")) {
                 $page->set_mime(MimeType::XML_APPLICATION);
-                $page->set_data($this->api_find_posts());
+                $page->set_data((string)$this->api_find_posts());
             } elseif ($event->page_matches("api/danbooru/find_tags")) {
                 $page->set_mime(MimeType::XML_APPLICATION);
-                $page->set_data($this->api_find_tags());
+                $page->set_data((string)$this->api_find_tags());
             }
 
             // Hackery for danbooruup 0.3.2 providing the wrong view url. This simply redirects to the proper
@@ -37,7 +44,7 @@ class DanbooruApi extends Extension
      * Authenticates a user based on the contents of the login and password parameters
      * or makes them anonymous. Does not set any cookies or anything permanent.
      */
-    private function authenticate_user()
+    private function authenticate_user(): void
     {
         global $config, $user;
 
@@ -66,7 +73,7 @@ class DanbooruApi extends Extension
      * - tags: any typical tag query. See Tag#parse_query for details.
      * - after_id: limit results to tags with an id number after after_id. Useful if you only want to refresh
      */
-    private function api_find_tags(): string
+    private function api_find_tags(): HTMLElement
     {
         global $database;
         $results = [];
@@ -110,16 +117,15 @@ class DanbooruApi extends Extension
         }
 
         // Tag results collected, build XML output
-        $xml = "<tags>\n";
+        $xml = TAGS();
         foreach ($results as $tag) {
-            $xml .= xml_tag("tag", [
+            $xml->appendChild(TAG([
                 "type" => "0",
                 "counts" => $tag[0],
                 "name" => $tag[1],
                 "id" => $tag[2],
-            ]);
+            ]));
         }
-        $xml .= "</tags>";
         return $xml;
     }
 
@@ -137,7 +143,7 @@ class DanbooruApi extends Extension
      *
      * #return string
      */
-    private function api_find_posts()
+    private function api_find_posts(): HTMLElement
     {
         $results = [];
 
@@ -175,7 +181,7 @@ class DanbooruApi extends Extension
 
         // Now we have the array $results filled with Image objects
         // Let's display them
-        $xml = "<posts count=\"{$count}\" offset=\"{$start}\">\n";
+        $xml = POSTS(["count"=>$count, "offset"=>$start]);
         foreach ($results as $img) {
             // Sanity check to see if $img is really an image object
             // If it isn't (e.g. someone requested an invalid md5 or id), break out of the this
@@ -185,7 +191,7 @@ class DanbooruApi extends Extension
             $taglist = $img->get_tag_list();
             $owner = $img->get_owner();
             $previewsize = get_thumbnail_size($img->width, $img->height);
-            $xml .= xml_tag("post", [
+            $xml->appendChild(TAG([
                 "id" => $img->id,
                 "md5" => $img->hash,
                 "file_name" => $img->filename,
@@ -202,9 +208,8 @@ class DanbooruApi extends Extension
                 "source" => $img->source,
                 "score" => 0,
                 "author" => $owner->name
-            ]);
+            ]));
         }
-        $xml .= "</posts>";
         return $xml;
     }
 
@@ -235,7 +240,7 @@ class DanbooruApi extends Extension
      * Get:
      * - Redirected to the newly uploaded post.
      */
-    private function api_add_post()
+    private function api_add_post(): void
     {
         global $user, $page;
         $danboorup_kludge = 1;            // danboorup for firefox makes broken links out of location: /path