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+<?php
+
+/**
+ * @file
+ * Default theme implementation to navigate books.
+ *
+ * Presented under nodes that are a part of book outlines.
+ *
+ * Available variables:
+ * - $tree: The immediate children of the current node rendered as an unordered
+ * list.
+ * - $current_depth: Depth of the current node within the book outline. Provided
+ * for context.
+ * - $prev_url: URL to the previous node.
+ * - $prev_title: Title of the previous node.
+ * - $parent_url: URL to the parent node.
+ * - $parent_title: Title of the parent node. Not printed by default. Provided
+ * as an option.
+ * - $next_url: URL to the next node.
+ * - $next_title: Title of the next node.
+ * - $has_links: Flags TRUE whenever the previous, parent or next data has a
+ * value.
+ * - $book_id: The book ID of the current outline being viewed. Same as the node
+ * ID containing the entire outline. Provided for context.
+ * - $book_url: The book/node URL of the current outline being viewed. Provided
+ * as an option. Not used by default.
+ * - $book_title: The book/node title of the current outline being viewed.
+ * Provided as an option. Not used by default.
+ *
+ * @see template_preprocess_book_navigation()
+ *
+ * @ingroup themeable
+ */
+?>
+<?php if ($tree || $has_links): ?>
+ <div id="book-navigation-<?php print $book_id; ?>" class="book-navigation">
+ <?php print $tree; ?>
+
+ <?php if ($has_links): ?>
+ <div class="page-links clearfix">
+ <?php if ($prev_url): ?>
+ <a href="<?php print $prev_url; ?>" class="page-previous" title="<?php print t('Go to previous page'); ?>"><?php print t('‹ ') . $prev_title; ?></a>
+ <?php endif; ?>
+ <?php if ($parent_url): ?>
+ <a href="<?php print $parent_url; ?>" class="page-up" title="<?php print t('Go to parent page'); ?>"><?php print t('up'); ?></a>
+ <?php endif; ?>
+ <?php if ($next_url): ?>
+ <a href="<?php print $next_url; ?>" class="page-next" title="<?php print t('Go to next page'); ?>"><?php print $next_title . t(' ›'); ?></a>
+ <?php endif; ?>
+ </div>
+ <?php endif; ?>
+
+ </div>
+<?php endif; ?>