diff --git a/lib/Parser/AbstractEntry.php b/lib/Parser/AbstractEntry.php
new file mode 100644
index 0000000..b82b386
--- /dev/null
+++ b/lib/Parser/AbstractEntry.php
@@ -0,0 +1,36 @@
+<?php
+/** @license MIT
+ * Copyright 2018 J. King et al.
+ * See LICENSE and AUTHORS files for details */
+
+declare(strict_types=1);
+namespace MensBeam\Lax\Parser;
+
+use MensBeam\Lax\Feed as FeedStruct;
+use MensBeam\Lax\Entry as EntryStruct;
+
+trait AbstractEntry {
+    public function __construct($data, FeedStruct $feed) {
+        $this->data = $data;
+        $this->feed = $feed;
+        $this->url = $feed->meta->url ? (string) $feed->meta->url : null;
+    }
+
+    public function parse(EntryStruct $entry = null): EntryStruct {
+        $entry = $this->init($entry ?? new EntryStruct);
+        $entry->lang = $this->getLang();
+        $entry->id = $this->getId();
+        $entry->link = $this->getLink();
+        $entry->relatedLink = $this->getRelatedLink();
+        $entry->title = $this->getTitle();
+        $entry->dateModified = $this->getDateModified();
+        $entry->dateCreated = $this->getDateCreated();
+        $entry->content = $this->getContent();
+        $entry->summary = $this->getSummary();
+        $entry->banner = $this->getBanner();
+        $entry->people = $this->getPeople();
+        $entry->categories = $this->getCategories();
+        $entry->enclosures = $this->getEnclosures();
+        return $entry;
+    }
+}
\ No newline at end of file
diff --git a/lib/Parser/AbstractFeed.php b/lib/Parser/AbstractFeed.php
new file mode 100644
index 0000000..175474d
--- /dev/null
+++ b/lib/Parser/AbstractFeed.php
@@ -0,0 +1,41 @@
+<?php
+/** @license MIT
+ * Copyright 2018 J. King et al.
+ * See LICENSE and AUTHORS files for details */
+
+declare(strict_types=1);
+namespace MensBeam\Lax\Parser;
+
+use MensBeam\Lax\Url;
+use MensBeam\Lax\Feed as FeedStruct;
+
+trait AbstractFeed {
+    /** Constructs a feed parser */
+    public function __construct(string $data, string $contentType = null, string $url = null) {
+        $this->data = $data;
+        $this->contentType = $contentType;
+        if (strlen($url ?? "")) {
+            $this->url = $url;
+        }
+    }
+
+    /** Parses the feed to extract data */
+    public function parse(FeedStruct $feed = null): FeedStruct {
+        $feed = $this->init($feed ?? new FeedStruct);
+        $feed->meta->url = strlen($this->url ?? "") ? new Url($this->url) : null;
+        $feed->sched = $this->getSchedule();
+        $feed->id = $this->getId();
+        $feed->lang = $this->getLang();
+        $feed->url = $this->getUrl();
+        $feed->link = $this->getLink();
+        $feed->title = $this->getTitle();
+        $feed->summary = $this->getSummary();
+        $feed->dateModified = $this->getDateModified();
+        $feed->icon = $this->getIcon();
+        $feed->image = $this->getImage();
+        $feed->people = $this->getPeople();
+        $feed->categories = $this->getCategories();
+        $feed->entries = $this->getEntries($feed);
+        return $feed;
+    }
+}
\ No newline at end of file
diff --git a/lib/Parser/Feed.php b/lib/Parser/Feed.php
index 0e2f80b..d2cbafb 100644
--- a/lib/Parser/Feed.php
+++ b/lib/Parser/Feed.php
@@ -15,6 +15,9 @@ use MensBeam\Lax\Feed as FeedStruct;
 use MensBeam\Lax\Url;
 
 interface Feed {
+    /** Maximally populates a Feed object */
+    public function parse(FeedStruct $feed = null): FeedStruct;
+
     /** Returns the globally unique identifier of the newsfeed; this is usually a URI */
     public function getId(): ?string;
 
diff --git a/lib/Parser/JSON/Construct.php b/lib/Parser/JSON/Construct.php
index 0b86db1..fc442a6 100644
--- a/lib/Parser/JSON/Construct.php
+++ b/lib/Parser/JSON/Construct.php
@@ -13,7 +13,7 @@ use MensBeam\Lax\Person\Collection as PersonCollection;
 use MensBeam\Lax\Person\Person;
 use MensBeam\Lax\Url;
 
-trait Construct {
+abstract class Construct {
     use \MensBeam\Lax\Parser\Construct;
 
     /** Returns an object member if the member exists and is of the expected type
diff --git a/lib/Parser/JSON/Entry.php b/lib/Parser/JSON/Entry.php
index 57492c1..65c4585 100644
--- a/lib/Parser/JSON/Entry.php
+++ b/lib/Parser/JSON/Entry.php
@@ -17,8 +17,8 @@ use MensBeam\Lax\Enclosure\Enclosure;
 use MensBeam\Lax\Text;
 use MensBeam\Lax\Url;
 
-class Entry implements \MensBeam\Lax\Parser\Entry {
-    use Construct;
+class Entry extends Construct implements \MensBeam\Lax\Parser\Entry {
+    use \MensBeam\Lax\Parser\AbstractEntry;
 
     protected $url;
     /** @var \MensBeam\Lax\Feed */
@@ -26,34 +26,10 @@ class Entry implements \MensBeam\Lax\Parser\Entry {
     /** @var \Mimey\MimeTypes */
     protected $mime;
 
-    public function __construct(\stdClass $data, FeedStruct $feed) {
-        $this->data = $data;
-        $this->feed = $feed;
-        $this->url = $feed->meta->url ? (string) $feed->meta->url : null;
-    }
-
     protected function init(EntryStruct $entry): EntryStruct {
         return $entry;
     }
 
-    public function parse(EntryStruct $entry = null): EntryStruct {
-        $entry = $this->init($entry ?? new EntryStruct);
-        $entry->lang = $this->getLang();
-        $entry->id = $this->getId();
-        $entry->link = $this->getLink();
-        $entry->relatedLink = $this->getRelatedLink();
-        $entry->title = $this->getTitle();
-        $entry->dateModified = $this->getDateModified();
-        $entry->dateCreated = $this->getDateCreated();
-        $entry->content = $this->getContent();
-        $entry->summary = $this->getSummary();
-        $entry->banner = $this->getBanner();
-        $entry->people = $this->getPeople();
-        $entry->categories = $this->getCategories();
-        $entry->enclosures = $this->getEnclosures();
-        return $entry;
-    }
-
     public function getId(): ?string {
         $id = $this->fetchMember("id", "str") ?? $this->fetchMember("id", "int") ?? $this->fetchMember("id", "float");
         if (is_null($id)) {
diff --git a/lib/Parser/JSON/Feed.php b/lib/Parser/JSON/Feed.php
index 2eae316..25a6f7a 100644
--- a/lib/Parser/JSON/Feed.php
+++ b/lib/Parser/JSON/Feed.php
@@ -17,8 +17,8 @@ use MensBeam\Lax\Category\Collection as CategoryCollection;
 use MensBeam\Lax\Parser\Exception;
 use MensBeam\Lax\Parser\JSON\Entry as EntryParser;
 
-class Feed implements \MensBeam\Lax\Parser\Feed {
-    use Construct;
+class Feed extends Construct implements \MensBeam\Lax\Parser\Feed {
+    use \MensBeam\Lax\Parser\AbstractFeed;
 
     protected const VERSIONS = [
         'https://jsonfeed.org/version/1'   => "1",
@@ -34,15 +34,6 @@ class Feed implements \MensBeam\Lax\Parser\Feed {
     protected $contentType;
     protected $url;
 
-    /** Constructs a feed parser without actually doing anything */
-    public function __construct(string $data, string $contentType = null, string $url = null) {
-        $this->data = $data;
-        $this->contentType = $contentType;
-        if (strlen($url ?? "")) {
-            $this->url = $url;
-        }
-    }
-
     /** Performs format-specific preparation and validation */
     protected function init(FeedStruct $feed): FeedStruct {
         $type = MimeType::parse($this->contentType);
@@ -62,26 +53,6 @@ class Feed implements \MensBeam\Lax\Parser\Feed {
         return $feed;
     }
 
-    /** Parses the feed to extract data */
-    public function parse(FeedStruct $feed = null): FeedStruct {
-        $feed = $this->init($feed ?? new FeedStruct);
-        $feed->meta->url = strlen($this->url ?? "") ? new Url($this->url) : null;
-        $feed->sched = $this->getSchedule();
-        $feed->id = $this->getId();
-        $feed->lang = $this->getLang();
-        $feed->url = $this->getUrl();
-        $feed->link = $this->getLink();
-        $feed->title = $this->getTitle();
-        $feed->summary = $this->getSummary();
-        $feed->dateModified = $this->getDateModified();
-        $feed->icon = $this->getIcon();
-        $feed->image = $this->getImage();
-        $feed->people = $this->getPeople();
-        $feed->categories = $this->getCategories();
-        $feed->entries = $this->getEntries($feed);
-        return $feed;
-    }
-
     /** {@inheritdoc}
      *
      * For JSON feeds this is always the feed URL specified in the feed
diff --git a/lib/Parser/XML/Entry.php b/lib/Parser/XML/Entry.php
index 83aaeb4..30cdc84 100644
--- a/lib/Parser/XML/Entry.php
+++ b/lib/Parser/XML/Entry.php
@@ -18,6 +18,8 @@ use MensBeam\Lax\Text;
 use MensBeam\Lax\Url;
 
 class Entry extends Construct implements \MensBeam\Lax\Parser\Entry {
+    use \MensBeam\Lax\Parser\AbstractEntry;
+
     protected const ENCLOSURE_ATTR_INTEGERS = [
         'size'     => "@fileSize",
         'width'    => "@width",
diff --git a/lib/Parser/XML/Feed.php b/lib/Parser/XML/Feed.php
index 16e4e84..be9cc9f 100644
--- a/lib/Parser/XML/Feed.php
+++ b/lib/Parser/XML/Feed.php
@@ -19,6 +19,8 @@ use MensBeam\Lax\Text;
 use MensBeam\Lax\Url;
 
 class Feed extends Construct implements \MensBeam\Lax\Parser\Feed {
+    use \MensBeam\Lax\Parser\AbstractFeed;
+
     protected const LIBXML_OPTIONS = \LIBXML_BIGLINES | \LIBXML_COMPACT | \LIBXML_HTML_NODEFDTD | \LIBXML_NOCDATA | \LIBXML_NOENT | \LIBXML_NONET | \LIBXML_NOERROR | LIBXML_NOWARNING;
     public const MIME_TYPES = [
         "application/atom+xml",     // Atom
@@ -39,15 +41,6 @@ class Feed extends Construct implements \MensBeam\Lax\Parser\Feed {
     /** @var \DOMXpath */
     protected $xpath;
 
-    /** Constructs a parsed feed */
-    public function __construct(string $data, string $contentType = null, string $url = null) {
-        $this->data = $data;
-        $this->contentType = $contentType;
-        if (strlen($url ?? "")) {
-            $this->url = $url;
-        }
-    }
-
     /** Performs initialization of the instance */
     protected function init(FeedStruct $feed): FeedStruct {
         $type = MimeType::parse($this->contentType) ?? "";
@@ -92,26 +85,6 @@ class Feed extends Construct implements \MensBeam\Lax\Parser\Feed {
         return $feed;
     }
 
-    /** Parses the feed to extract data */
-    public function parse(FeedStruct $feed = null): FeedStruct {
-        $feed = $this->init($feed ?? new FeedStruct);
-        $feed->meta->url = strlen($this->url ?? "") ? new Url($this->url) : null;
-        $feed->sched = $this->getSchedule();
-        $feed->id = $this->getId();
-        $feed->lang = $this->getLang();
-        $feed->url = $this->getUrl();
-        $feed->link = $this->getLink();
-        $feed->title = $this->getTitle();
-        $feed->summary = $this->getSummary();
-        $feed->dateModified = $this->getDateModified();
-        $feed->icon = $this->getIcon();
-        $feed->image = $this->getImage();
-        $feed->people = $this->getPeople();
-        $feed->categories = $this->getCategories();
-        $feed->entries = $this->getEntries($feed);
-        return $feed;
-    }
-
     public function getId(): ?string {
         return $this->getIdAtom()   // Atom ID
             ?? $this->getIdDC()     // Dublin Core ID