Initial commit

.dir-locals.el

+((nil . ((php-project-name . "HAB RFC4287"))))

.gitignore

+# GNU Emacs
+
+*~
+\#*
+ChangeLog
+
+# Composer
+composer.lock
+/vendor/

Makefile

+.PHONY: test
+test:
+	phpunit

README.md

+HAB RFC4287 – Atom Syndication Format for PHP
+=============================================
+
+This source code is Copyright (c) 2017 by Herzog August Bibliothek Wolfenbüttel and released under the terms of the GNU
+General Public License 3 or higher.

composer.json

+{
+    "name": "hab/rfc4287",
+    "autoload": {
+        "psr-0": {
+            "HAB": "src/"
+        }
+    }
+}

phpunit.xml

+<?xml version="1.0" encoding="utf-8"?>
+<phpunit bootstrap="vendor/autoload.php" strict="true">
+  <testsuite name="Unit tests">
+    <directory suffix="Test.php">tests/unit-tests</directory>
+  </testsuite>
+</phpunit>

src/HAB/RFC4287/Builder.php

+<?php
+
+/**
+ * This file is part of HAB RFC4287.
+ *
+ * HAB RFC4287 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HAB RFC4287 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HAB RFC4287.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+
+namespace HAB\RFC4287;
+
+use DOMDocument;
+use SimpleXMLElement;
+
+use DateTimeInterface;
+use DateTimeImmutable;
+
+/**
+ * Abstract base class of FeedBuilder and EntryBuilder.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+abstract class Builder
+{
+    /**
+     * Current container.
+     *
+     * @var Model\Container
+     */
+    protected $container;
+
+    /**
+     * Constructor.
+     *
+     * @return void
+     */
+    public function __construct ()
+    {
+        $this->init();
+    }
+
+    /**
+     * Initialize builder.
+     *
+     * @return void
+     */
+    abstract public function init ();
+
+    /**
+     * Set container property.
+     *
+     * @param  string                   $name
+     * @param  Model\VisitableInterface $value
+     * @return static
+     */
+    public function set ($name, Model\VisitableInterface $value)
+    {
+        $this->container[$name] = $value;
+        return $this;
+    }
+
+    /**
+     * Return container property.
+     *
+     * @param  string $name
+     * @return Model\VisitableInterface|null
+     */
+    public function get ($name)
+    {
+        if (isset($this->container[$name])) {
+            return $this->container[$name];
+        }
+    }
+
+    /**
+     * Add a link.
+     *
+     * @param  string $target
+     * @param  string $relation
+     * @param  string $title
+     * @param  string $type
+     * @param  string $hreflang
+     * @param  string $length
+     * @return static
+     */
+    public function link ($target, $relation, $title = null, $type = null, $hreflang = null, $length = null)
+    {
+        if (!isset($this->container['link'])) {
+            $this->container['link'] = new Model\VisitableAggregate();
+        }
+        $this->container['link']->append(new Model\Link($target, $relation, $title, $type, $hreflang, $length));
+        return $this;
+    }
+
+    /**
+     * Add updated timestamp.
+     *
+     * @param  string|DateTimeInterface $datetime
+     * @return static
+     */
+    public function updated ($datetime)
+    {
+        if (!$datetime instanceof DateTimeInterface) {
+            $datetime = new DateTimeImmutable($datetime);
+        }
+        $this->container['updated'] = new Model\DateConstruct($datetime);
+        return $this;
+    }
+
+    /**
+     * Add title.
+     *
+     * @param  mixed  $content
+     * @param  string $type
+     * @return static
+     */
+    public function title ($content, $type = 'text')
+    {
+        $title = $this->makeTextConstruct($content, $type);
+        $this->container['title'] = $title;
+        return $this;
+    }
+
+    /**
+     * Add id.
+     *
+     * @param  string $id
+     * @return static
+     */
+    public function id ($id)
+    {
+        $this->container['id'] = new Model\Literal($id);
+        return $this;
+    }
+
+    /**
+     * Add category.
+     *
+     * @param  string $term
+     * @param  string $scheme
+     * @param  string $label
+     * @return static
+     */
+    public function category ($term, $scheme = null, $label = null)
+    {
+        if (!isset($this->container['category'])) {
+            $this->container['category'] = new Model\VisitableAggregate();
+        }
+        $this->container['category']->append(new Model\Category($term, $scheme, $label));
+        return $this;
+    }
+
+    /**
+     * Add author.
+     *
+     * @param  string $name
+     * @param  string $email
+     * @param  string $url
+     * @return static
+     */
+    public function author ($name, $email = null, $url = null)
+    {
+        $author = new Model\PersonConstruct($name, $email, $url);
+        if (!isset($this->container['author'])) {
+            $this->container['author'] = new Model\VisitableAggregate();
+        }
+        $this->container['author']->append($author);
+        return $this;
+    }
+
+    /**
+     * Add contributor.
+     *
+     * @param  string $name
+     * @param  string $email
+     * @param  string $url
+     * @return static
+     */
+    public function contributor ($name, $email = null, $url = null)
+    {
+        $contributor = new Model\PersonConstruct($name, $email, $url);
+        if (!isset($this->container['contributor'])) {
+            $this->container['contributor'] = new Model\VisitableAggregate();
+        }
+        $this->container['contributor']->append($contributor);
+        return $this;
+    }
+
+    /**
+     * Add rights.
+     *
+     * @param  mixed  $rights
+     * @param  string $type
+     * @return static
+     */
+    public function rights ($rights, $type = 'text')
+    {
+        $text = $this->makeTextConstruct($rights, $type);
+        $this->container['rights'] = $text;
+        return $this;
+    }
+
+    /**
+     * Return text construct.
+     *
+     * @param  mixed  $content
+     * @param  string $type
+     * @param  array  $attributes
+     * @return Model\TextConstruct
+     */
+    public function makeTextConstruct ($content, $type)
+    {
+        if ($type === 'xhtml' or preg_match('@^[^/]+/(xml|[^+]+\+xml)$@u', $type)) {
+            $text = new Model\XmlTextConstruct($content, $type);
+        } else {
+            $text = new Model\PlainTextConstruct($content, $type);
+        }
+        return $text;
+    }
+
+}
\ No newline at end of file

src/HAB/RFC4287/EntryBuilder.php

+<?php
+
+/**
+ * This file is part of HAB RFC4287.
+ *
+ * HAB RFC4287 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HAB RFC4287 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HAB RFC4287.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+
+namespace HAB\RFC4287;
+
+/**
+ * Entry builder.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+class EntryBuilder extends Builder
+{
+    /**
+     * Feed builder.
+     *
+     * @var FeedBuilder
+     */
+    private $feed;
+
+    /**
+     * Constructor.
+     *
+     * @param  FeedBuilder $feed
+     * @return void
+     */
+    public function __construct (FeedBuilder $feed)
+    {
+        parent::__construct();
+        $this->feed = $feed;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function init ()
+    {
+        $this->container = new Model\Entry();
+    }
+
+    /**
+     * Add content.
+     *
+     * @param  mixed  $content
+     * @param  string $type
+     * @param  string $source
+     * @return self
+     */
+    public function content ($content, $type = 'text', $source = null)
+    {
+        if ($source) {
+            $text = new Model\OutOfLineContent($source, $type);
+        } else {
+            $text = $this->makeTextConstruct($content, $type);
+        }
+        $this->container['content'] = $text;
+        return $this;
+    }
+
+    /**
+     * Add source.
+     *
+     * @param  Model\Feed $source
+     * @return static
+     */
+    public function source (Model\Feed $source)
+    {
+        $this->container['source'] = $source;
+        return $this;
+    }
+
+    /**
+     * Add summary.
+     *
+     * @param  mixed  $summary
+     * @param  string $type
+     * @return self
+     */
+    public function summary ($summary, $type = 'text')
+    {
+        $text = $this->makeTextConstruct($summary, $type);
+        $this->container['summary'] = $text;
+        return $this;
+    }
+
+    /**
+     * Add current entry to feed.
+     *
+     * @return FeedBuilder
+     */
+    public function add ()
+    {
+        $this->feed->entry($this->container);
+        $this->init();
+        return $this->feed;
+    }
+
+}
\ No newline at end of file

src/HAB/RFC4287/FeedBuilder.php

+<?php
+
+/**
+ * This file is part of HAB RFC4287.
+ *
+ * HAB RFC4287 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HAB RFC4287 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HAB RFC4287.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+
+namespace HAB\RFC4287;
+
+/**
+ * Feed builder.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+class FeedBuilder extends Builder
+{
+    /**
+     * Entry builder instance.
+     *
+     * @var EntryBuilder
+     */
+    private $entries;
+
+    /**
+     * {@inheritDoc}
+     */
+    public function init ()
+    {
+        $this->container = new Model\Feed();
+    }
+
+    /**
+     * Add entry or return entry builder.
+     *
+     * @param  Entry $entry
+     * @return static|EntryBuilder
+     */
+    public function entry (Model\Entry $entry = null)
+    {
+        if ($entry) {
+            if (!isset($this->container['entry'])) {
+                $this->container['entry'] = new Model\VisitableAggregate();
+            }
+            $this->container['entry']->append($entry);
+            if ($entry['updated'] > $this->container['updated']) {
+                $this->container['updated'] = clone($entry['updated']);
+            }
+            return $this;
+        }
+        if (!$this->entries) {
+            $this->entries = new EntryBuilder($this);
+        }
+        return $this->entries;
+    }
+
+    /**
+     * Add generator.
+     *
+     * @param  string $name
+     * @param  string $version
+     * @param  string $uri
+     * @return self
+     */
+    public function generator ($name, $version = null, $uri = null)
+    {
+        $this->container['generator'] = new Model\Generator($name, $version, $uri);
+        return $this;
+    }
+
+    /**
+     * Add icon.
+     *
+     * @param  string $uri
+     * @return static
+     */
+    public function icon ($uri)
+    {
+        $this->container['icon'] = new Model\Literal($uri);
+        return $this;
+    }
+
+    /**
+     * Add logo.
+     *
+     * @param  string $uri
+     * @return static
+     */
+    public function logo ($uri)
+    {
+        $this->container['logo'] = new Model\Literal($uri);
+        return $this;
+    }
+
+    /**
+     * Add subtitle.
+     *
+     * @param  mixed  $subtitle
+     * @param  string $type
+     * @return self
+     */
+    public function subtitle ($subtitle, $type = 'text')
+    {
+        $text = $this->makeTextConstruct($subtitle, $type);
+        $this->container['subtitle'] = $text;
+        return $this;
+    }
+
+    /**
+     * Return current feed.
+     *
+     * @return Feed
+     */
+    public function getFeed ()
+    {
+        if (!$this->container['updated']) {
+            $this->updated('now');
+        }
+        $this->container->sort();
+        return $this->container;
+    }
+}
\ No newline at end of file

src/HAB/RFC4287/Model/Category.php

+<?php
+
+/**
+ * This file is part of HAB RFC4287.
+ *
+ * HAB RFC4287 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HAB RFC4287 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HAB RFC4287.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+
+namespace HAB\RFC4287\Model;
+
+/**
+ * Category.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+class Category implements VisitableInterface
+{
+    /**
+     * Term.
+     *
+     * @var string
+     */
+    private $term;
+
+    /**
+     * Scheme.
+     *
+     * @var string
+     */
+    private $scheme;
+
+    /**
+     * Label.
+     *
+     * @var string
+     */
+    private $label;
+
+    /**
+     * Constructor.
+     *
+     * @param  string             $term
+     * @param  string             $scheme
+     * @param  string             $label
+     * @return void
+     */
+    public function __construct ($term, $scheme = null, $label = null)
+    {
+        $this->term = $term;
+        $this->scheme = $scheme;
+        $this->label = $label;
+    }
+
+    /**
+     * Return term.
+     *
+     * @return string
+     */
+    public function getTerm ()
+    {
+        return $this->term;
+    }
+
+    /**
+     * Return scheme.
+     *
+     * @return string|null
+     */
+    public function getScheme ()
+    {
+        return $this->scheme;
+    }
+
+    /**
+     * Return label.
+     *
+     * @return string|null
+     */
+    public function getLabel ()
+    {
+        return $this->label;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function accept (VisitorInterface $visitor, $qname)
+    {
+        $visitor->visitCategory($this, $qname);
+    }
+
+}
\ No newline at end of file

src/HAB/RFC4287/Model/Container.php

+<?php
+
+/**
+ * This file is part of HAB RFC4287.
+ *
+ * HAB RFC4287 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HAB RFC4287 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HAB RFC4287.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+
+namespace HAB\RFC4287\Model;
+
+use ArrayAccess;
+use ArrayIterator;
+use IteratorAggregate;
+use InvalidArgumentException;
+
+/**
+ * Atom container.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+abstract class Container implements ArrayAccess, IteratorAggregate
+{
+    /**
+     * Feed data.
+     *
+     * @var array
+     */
+    protected $data;
+
+    /**
+     * Constructor.
+     *
+     * @return void
+     */
+    public function __construct ()
+    {
+        $this->data = array();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function offsetGet ($index)
+    {
+        if (array_key_exists($index, $this->data)) {
+            return $this->data[$index];
+        }
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function offsetSet ($index, $value)
+    {
+        if (!$value instanceof VisitableInterface) {
+            throw new InvalidArgumentException(sprintf('Feed element must implement %s', VisitableInterface::class));
+        }
+        $this->data[$index] = $value;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function offsetExists ($index)
+    {
+        return array_key_exists($index, $this->data);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function offsetUnset ($index)
+    {
+        unset($this->data[$index]);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getIterator ()
+    {
+        return new ArrayIterator($this->data);
+    }
+}
\ No newline at end of file

src/HAB/RFC4287/Model/DateConstruct.php

+<?php
+
+/**
+ * This file is part of HAB RFC4287.
+ *
+ * HAB RFC4287 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HAB RFC4287 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HAB RFC4287.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+
+namespace HAB\RFC4287\Model;
+
+use DateTimeInterface;
+use DateTime;
+
+/**
+ * Atom date construct.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+class DateConstruct implements VisitableInterface
+{
+    /**
+     * Datetime instance.
+     *
+     * @var DateTimeInterface
+     */
+    private $datetime;
+
+    /**
+     * Constructor.
+     *
+     * @param  DateTimeInterface $datetime
+     * @return void
+     */
+    public function __construct (DateTimeInterface $datetime)
+    {
+        $this->datetime = $datetime;
+    }
+
+    /**
+     * Format the datetime object.
+     *
+     * @param  string $format
+     * @return string
+     */
+    public function format ($format)
+    {
+        return $this->datetime->format($format);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function accept (VisitorInterface $visitor, $qname)
+    {
+        $visitor->visitDateConstruct($this, $qname);
+    }
+}
\ No newline at end of file

src/HAB/RFC4287/Model/Entry.php

+<?php
+
+/**
+ * This file is part of HAB RFC4287.
+ *
+ * HAB RFC4287 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HAB RFC4287 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HAB RFC4287.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+
+namespace HAB\RFC4287\Model;
+
+/**
+ * Entry.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+class Entry extends Container implements VisitableInterface
+{
+    /**
+     * {@inheritDoc}
+     */
+    public function accept (VisitorInterface $visitor, $qname)
+    {
+        $visitor->visitEntry($this, 'entry');
+    }
+}
\ No newline at end of file

src/HAB/RFC4287/Model/Feed.php

+<?php
+
+/**
+ * This file is part of HAB RFC4287.
+ *
+ * HAB RFC4287 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HAB RFC4287 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HAB RFC4287.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+
+namespace HAB\RFC4287\Model;
+
+/**
+ * Atom Feed.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+class Feed extends Container implements VisitableInterface
+{
+    /**
+     * Sort feed elements.
+     *
+     * @return void
+     */
+    public function sort ()
+    {
+        uksort($this->data, array($this, 'compareQNames'));
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function accept (VisitorInterface $visitor, $qname)
+    {
+        $visitor->visitFeed($this, $qname);
+    }
+
+    /**
+     * Comparism function for {@see self::sort()}.
+     *
+     * @param  string $qname_a
+     * @param  string $qname_b
+     * @return integer
+     */
+    public function compareQNames ($qname_a, $qname_b)
+    {
+        if ($qname_a === 'entry') {
+            return 1;
+        }
+        return 0;
+    }
+}
\ No newline at end of file

src/HAB/RFC4287/Model/Generator.php

+<?php
+
+/**
+ * This file is part of HAB RFC4287.
+ *
+ * HAB RFC4287 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HAB RFC4287 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HAB RFC4287.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+
+namespace HAB\RFC4287\Model;
+
+/**
+ * Generator.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+class Generator implements VisitableInterface
+{
+    /**
+     * URI.
+     *
+     * @var string
+     */
+    private $uri;
+
+    /**
+     * Version.
+     *
+     * @var string
+     */
+    private $version;
+
+    /**
+     * Name.
+     *
+     * @var string
+     */
+    private $name;
+
+    /**
+     * Constructor.
+     *
+     * @param  string $name
+     * @param  string $version
+     * @param  string $uri
+     * @return void
+     */
+    public function __construct ($name, $version = null, $uri = null)
+    {
+        $this->name = $name;
+        $this->version = $version;
+        $this->uri = $uri;
+    }
+
+    /**
+     * Return name.
+     *
+     * @return string
+     */
+    public function getName ()
+    {
+        return $this->name;
+    }
+    /**
+     * Return version.
+     *
+     * @return string|null
+     */
+    public function getVersion ()
+    {
+        return $this->version;
+    }
+    /**
+     * Return uri.
+     *
+     * @return string|null
+     */
+    public function getUri ()
+    {
+        return $this->uri;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+     public function accept (VisitorInterface $visitor, $qname)
+     {
+         $visitor->visitGenerator($this, $qname);
+     }
+
+}
\ No newline at end of file

src/HAB/RFC4287/Model/Link.php

+<?php
+
+/**
+ * This file is part of HAB RFC4287.
+ *
+ * HAB RFC4287 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HAB RFC4287 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HAB RFC4287.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+
+namespace HAB\RFC4287\Model;
+
+/**
+ * Atom Link.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+class Link implements VisitableInterface
+{
+    /**
+     * Link target.
+     *
+     * @var string
+     */
+    private $target;
+
+    /**
+     * Link relation.
+     *
+     * @var string
+     */
+    private $relation;
+
+    /**
+     * Link title.
+     *
+     * @var string
+     */
+    private $title;
+
+    /**
+     * Link target language.
+     *
+     * @var string
+     */
+    private $language;
+
+    /**
+     * Link target type.
+     *
+     * @var string
+     */
+    private $type;
+
+    /**
+     * Link target size.
+     *
+     * @var string
+     */
+    private $length;
+
+    /**
+     * Constructor.
+     *
+     * @param  string $target
+     * @param  string $relation
+     * @param  string
+     * @return void
+     */
+    public function __construct ($target, $relation, $title = null, $type = null, $language = null, $length)
+    {
+        $this->target = $target;
+        $this->relation = $relation;
+        $this->title = $title;
+        $this->language = $language;
+        $this->type = $type;
+        $this->length = $length;
+    }
+
+    /**
+     * Return target.
+     *
+     * @return string
+     */
+    public function getTarget ()
+    {
+        return $this->target;
+    }
+
+    /**
+     * Return relation.
+     *
+     * @return string
+     */
+    public function getRelation ()
+    {
+        return $this->relation;
+    }
+
+    /**
+     * Return title.
+     *
+     * @return string|null
+     */
+    public function getTitle ()
+    {
+        return $this->title;
+    }
+
+    /**
+     * Return target language.
+     *
+     * @return string|null
+     */
+    public function getTargetLanguage ()
+    {
+        return $this->language;
+    }
+
+    /**
+     * Return type.
+     *
+     * @return string|null
+     */
+    public function getTargetType ()
+    {
+        return $this->type;
+    }
+
+    /**
+     * Return length.
+     *
+     * @return string|null
+     */
+    public function getTargetLength ()
+    {
+        return $this->length;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function accept (VisitorInterface $visitor, $qname)
+    {
+        $visitor->visitLink($this, $qname);
+    }
+
+}
\ No newline at end of file

src/HAB/RFC4287/Model/Literal.php

+<?php
+
+/**
+ * This file is part of HAB RFC4287.
+ *
+ * HAB RFC4287 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HAB RFC4287 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HAB RFC4287.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+
+namespace HAB\RFC4287\Model;
+
+/**
+ * Literal value.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+class Literal implements VisitableInterface
+{
+    /**
+     * Value.
+     *
+     * @var string
+     */
+    private $value;
+
+    /**
+     * Constructor.
+     *
+     * @param  string $value
+     * @return void
+     */
+    public function __construct ($value)
+    {
+        $this->value = $value;
+    }
+
+    /**
+     * Return value.
+     *
+     * @return string
+     */
+    public function getValue ()
+    {
+        return $this->value;
+    }
+    
+    /**
+     * {@inheritDoc}
+     */
+    public function accept (VisitorInterface $visitor, $qname)
+    {
+        $visitor->visitLiteral($this, $qname);
+    }
+}
\ No newline at end of file

src/HAB/RFC4287/Model/OutOfLineContent.php

+<?php
+
+/**
+ * This file is part of HAB RFC4287.
+ *
+ * HAB RFC4287 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HAB RFC4287 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HAB RFC4287.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+
+namespace HAB\RFC4287\Model;
+
+/**
+ * Out of line content.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+class OutOfLineContent implements VisitableInterface
+{
+    /**
+     * Type.
+     *
+     * @var string
+     */
+    private $type;
+
+    /**
+     * Source.
+     *
+     * @var string
+     */
+    private $source;
+
+    /**
+     * Constructor.
+     *
+     * @param  string $source
+     * @param  string $type
+     * @return void
+     */
+    public function __construct ($source, $type)
+    {
+        $this->type = $type;
+        $this->source = $source;
+    }
+
+    /**
+     * Return type.
+     *
+     * @return string
+     */
+    public function getType ()
+    {
+        return $this->type;
+    }
+
+    /**
+     * Return source.
+     *
+     * @return string
+     */
+    public function getSource ()
+    {
+        return $this->source;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function accept (VisitorInterface $visitor, $qname)
+    {
+        $visitor->visitOutOfLineContent($this, $qname);
+    }
+}
\ No newline at end of file

src/HAB/RFC4287/Model/PersonConstruct.php

+<?php
+
+/**
+ * This file is part of HAB RFC4287.
+ *
+ * HAB RFC4287 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HAB RFC4287 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HAB RFC4287.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+
+namespace HAB\RFC4287\Model;
+
+/**
+ * Person construct.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+class PersonConstruct implements VisitableInterface
+{
+    /**
+     * Name.
+     *
+     * @var string
+     */
+    private $name;
+
+    /**
+     * Email address.
+     *
+     * @var string
+     */
+    private $email;
+
+    /**
+     * Uri.
+     *
+     * @var string
+     */
+    private $uri;
+
+    /**
+     * Construct.
+     *
+     * @param  string $name
+     * @param  string $email
+     * @param  string $uri
+     * @return void
+     */
+    public function __construct ($name = null, $email = null, $uri = null)
+    {
+        $this->email = $email;
+        $this->name = $name;
+        $this->uri = $uri;
+    }
+
+    /**
+     * Return name.
+     *
+     * @return string
+     */
+    public function getName ()
+    {
+        return $this->name;
+    }
+
+    /**
+     * Return email.
+     *
+     * @return string
+     */
+    public function getEmail ()
+    {
+        return $this->email;
+    }
+
+    /**
+     * Return uri.
+     *
+     * @return string
+     */
+    public function getUri ()
+    {
+        return $this->uri;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function accept (VisitorInterface $visitor, $qname)
+    {
+        $visitor->visitPersonConstruct($this, $qname);
+    }
+}
\ No newline at end of file