Minor vocabulary fixes and structured data improvements (#3036)

* Remove duplicate Review object under `rating` property

This was preventing validation, since `rating` is not a valid property
(`review` is, which is created from book.html already).

* Drop `bestRating` property in ratings, since it defaults to 5

See <https://schema.org/bestRating> ("If bestRating is omitted,
5 is assumed").

* Create Rating object (and its enclosing Review) in book/rating.html

* Use `position` property for Book objects in a series

`volumeNumber`, previously used, is only valid for objects of type
PublicationVolume (which series members are not).

* Give URL of book series when setting of `isPartOf`

* series.html: Add empty BookSeries object

---------

Co-authored-by: Adeodato Simó <dato@users.noreply.github.com>

bookwyrm/templates/book/book.html

@@ -44,16 +44,18 @@
                     {% endif %}
 
                     {% if book.series %}
-                        <meta itemprop="isPartOf" content="{{ book.series | escape }}">
+                        <meta itemprop="position" content="{{ book.series_number }}">
-                        <meta itemprop="volumeNumber" content="{{ book.series_number }}">
+                        <span itemprop="isPartOf" itemscope itemtype="https://schema.org/BookSeries">
-
                         {% if book.authors.exists %}
-                            <a href="{% url 'book-series-by' book.authors.first.id %}?series_name={{ book.series | urlencode }}">
+                            <a href="{% url 'book-series-by' book.authors.first.id %}?series_name={{ book.series | urlencode }}"
+                               itemprop="url">
                         {% endif %}
-                        {{ book.series }}{% if book.series_number %} #{{ book.series_number }}{% endif %}
+                        <span itemprop="name">{{ book.series }}</span>
+                        {% if book.series_number %} #{{ book.series_number }}{% endif %}
                         {% if book.authors.exists %}
                             </a>
                         {% endif %}
+                        </span>
                     {% endif %}
                 </p>
             {% endif %}
@@ -186,8 +188,6 @@
                     itemtype="https://schema.org/AggregateRating"
                 >
                     <meta itemprop="ratingValue" content="{{ rating|floatformat }}">
-                    {# @todo Is it possible to not hard-code the value? #}
-                    <meta itemprop="bestRating" content="5">
                     <meta itemprop="reviewCount" content="{{ review_count }}">
 
                     <span>

bookwyrm/templates/book/rating.html

@@ -5,13 +5,18 @@
             {% include 'snippets/avatar.html' with user=user %}
         </div>
 
-        <div class="media-content">
+        <div class="media-content" itemprop="review" itemscope itemtype="https://schema.org/Review">
-            <div>
+            <div itemprop="author"
-                <a href="{{ user.local_path }}">{{ user.display_name }}</a>
+                 itemscope
+                 itemtype="https://schema.org/Person"
+            >
+                <a href="{{ user.local_path }}" itemprop="url">
+                    <span itemprop="name">{{ user.display_name }}</span>
+                </a>
             </div>
-            <div class="is-flex">
+            <div class="is-flex" itemprop="reviewRating" itemscope itemtype="https://schema.org/Rating">
+                <meta itemprop="ratingValue" content="{{ rating.rating|floatformat }}">
                 <p class="mr-1">{% trans "rated it" %}</p>
-
                 {% include 'snippets/stars.html' with rating=rating.rating %}
             </div>
             <div>

bookwyrm/templates/book/series.html

@@ -5,15 +5,15 @@
 {% block title %}{{ series_name }}{% endblock %}
 
 {% block content %}
-<div class="block">
+<div class="block" itemscope itemtype="https://schema.org/BookSeries">
-	<h1 class="title">{{ series_name }}</h1>
+	<h1 class="title" itemprop="name">{{ series_name }}</h1>
 	<div class="subtitle" dir="auto">
 		{% trans "Series by" %} <a
 			href="{{ author.local_path }}"
 			class="author {{ link_class }}"
-			itemprop="author"
+			itemprop="creator"
 			itemscope
-			itemtype="https://schema.org/Thing"
+			itemtype="https://schema.org/Person"
 			><span
 					itemprop="name"
 					>{{ author.name }}</span></a>
@@ -22,6 +22,7 @@
 	<div class="columns is-multiline is-mobile">
 	{% for book in books %}
 	{% with book=book %}
+			{# @todo Set `hasPart` property in some meaningful way #}
 			<div class="column is-one-fifth-tablet is-half-mobile is-flex is-flex-direction-column">
 				<div class="is-flex-grow-1 mb-3">
 					<span class="subtitle">{% if book.series_number %}{% blocktrans with series_number=book.series_number %}Book {{ series_number }}{% endblocktrans %}{% else %}{% trans 'Unsorted Book' %}{% endif %}</span>

bookwyrm/templates/snippets/status/content_status.html

@@ -6,14 +6,6 @@
 {% load humanize %}
 
 {% with status_type=status.status_type %}
-<div
-    class="block"
-    {% if status_type == "Review" %}
-        itemprop="rating"
-        itemtype="https://schema.org/Rating"
-    {% endif %}
->
-
     <div class="columns is-gapless">
         {% if not hide_book %}
             {% with book=status.book|default:status.mention_books.first %}
@@ -58,9 +50,6 @@
                         {% endif %}
                     >
                         <meta itemprop="ratingValue" content="{{ status.rating|floatformat }}">
-
-                        {# @todo Is it possible to not hard-code the value? #}
-                        <meta itemprop="bestRating" content="5">
                     </span>
                     {% include 'snippets/stars.html' with rating=status.rating %}
                 </h4>
@@ -154,6 +143,5 @@
             </div>
         </article>
     </div>
-</div>
 
 {% endwith %}

bookwyrm/templates/snippets/status/headers/rating.html

@@ -16,9 +16,6 @@
         >
             <span class="is-hidden" {{ rating_type }}>
                 <meta itemprop="ratingValue" content="{{ status.rating|floatformat }}">
-
-                {# @todo Is it possible to not hard-code the value? #}
-                <meta itemprop="bestRating" content="5">
             </span>
         </span>
     </span>