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diff --git a/web/core/modules/filter/src/FilterFormatInterface.php b/web/core/modules/filter/src/FilterFormatInterface.php
new file mode 100644
index 000000000..6008f3fa4
--- /dev/null
+++ b/web/core/modules/filter/src/FilterFormatInterface.php
@@ -0,0 +1,90 @@
+<?php
+
+namespace Drupal\filter;
+
+use Drupal\Core\Config\Entity\ConfigEntityInterface;
+
+/**
+ * Provides an interface defining a filter format entity.
+ */
+interface FilterFormatInterface extends ConfigEntityInterface {
+
+  /**
+   * Returns the ordered collection of filter plugin instances or an individual plugin instance.
+   *
+   * @param string $instance_id
+   *   (optional) The ID of a filter plugin instance to return.
+   *
+   * @return \Drupal\filter\FilterPluginCollection|\Drupal\filter\Plugin\FilterInterface
+   *   Either the filter collection or a specific filter plugin instance.
+   */
+  public function filters($instance_id = NULL);
+
+  /**
+   * Sets the configuration for a filter plugin instance.
+   *
+   * Sets or replaces the configuration of a filter plugin in $this->filters,
+   * and if instantiated already, also ensures that the actual filter plugin on
+   * the FilterPluginCollection contains the identical configuration.
+   *
+   * @param string $instance_id
+   *   The ID of a filter plugin to set the configuration for.
+   * @param array $configuration
+   *   The filter plugin configuration to set.
+   */
+  public function setFilterConfig($instance_id, array $configuration);
+
+  /**
+   * Returns if this format is the fallback format.
+   *
+   * The fallback format can never be disabled. It must always be available.
+   *
+   * @return bool
+   *   TRUE if this format is the fallback format, FALSE otherwise.
+   */
+  public function isFallbackFormat();
+
+  /**
+   * Returns the machine-readable permission name for the text format.
+   *
+   * @return string|bool
+   *   The machine-readable permission name, or FALSE if the text format is
+   *   malformed or is the fallback format (which is available to all users).
+   */
+  public function getPermissionName();
+
+  /**
+   * Retrieves all filter types that are used in the text format.
+   *
+   * @return array
+   *   All filter types used by filters of the text format.
+   */
+  public function getFilterTypes();
+
+  /**
+   * Retrieve all HTML restrictions (tags and attributes) for the text format.
+   *
+   * Note that restrictions applied to the "*" tag (the wildcard tag, i.e. all
+   * tags) are treated just like any other HTML tag. That means that any
+   * restrictions applied to it are not automatically applied to all other tags.
+   * It is up to the caller to handle this in whatever way it sees fit; this way
+   * no information granularity is lost.
+   *
+   * @return array|false
+   *   A structured array as returned by FilterInterface::getHTMLRestrictions(),
+   *   but with the intersection of all filters in this text format.
+   *   Will either indicate blacklisting of tags or whitelisting of tags. In
+   *   the latter case, it's possible that restrictions on attributes are also
+   *   stored. FALSE means there are no HTML restrictions.
+   */
+  public function getHtmlRestrictions();
+
+  /**
+   * Removes a filter.
+   *
+   * @param string $instance_id
+   *   The ID of a filter plugin to be removed.
+   */
+  public function removeFilter($instance_id);
+
+}