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diff --git a/include/crm/common/action_relation_internal.h b/include/crm/common/action_relation_internal.h
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+++ b/include/crm/common/action_relation_internal.h
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+/*
+ * Copyright 2023 the Pacemaker project contributors
+ *
+ * The version control history for this file may have further details.
+ *
+ * This source code is licensed under the GNU Lesser General Public License
+ * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
+ */
+
+#ifndef PCMK__CRM_COMMON_ACTION_RELATION_INTERNAL__H
+#  define PCMK__CRM_COMMON_ACTION_RELATION_INTERNAL__H
+
+/*!
+ * Flags to indicate the relationship between two actions
+ *
+ * @COMPAT The values and semantics of these flags should not be changed until
+ * the deprecated enum pe_ordering is dropped from the public API.
+ */
+enum pcmk__action_relation_flags {
+    //! No relation (compare with equality rather than bit set)
+    pcmk__ar_none                           = 0U,
+
+    //! Actions are ordered (optionally, if no other flags are set)
+    pcmk__ar_ordered                        = (1U << 0),
+
+    //! Relation applies only if 'first' cannot be part of a live migration
+    pcmk__ar_if_first_unmigratable          = (1U << 1),
+
+    /*!
+     * If 'then' is required, 'first' becomes required (and becomes unmigratable
+     * if 'then' is); also, if 'first' is a stop of a blocked resource, 'then'
+     * becomes unrunnable
+     */
+    pcmk__ar_then_implies_first             = (1U << 4),
+
+    /*!
+     * If 'first' is required, 'then' becomes required; if 'first' is a stop of
+     * a blocked resource, 'then' becomes unrunnable
+     */
+    pcmk__ar_first_implies_then             = (1U << 5),
+
+    /*!
+     * If 'then' is required and for a promoted instance, 'first' becomes
+     * required (and becomes unmigratable if 'then' is)
+     */
+    pcmk__ar_promoted_then_implies_first    = (1U << 6),
+
+    /*!
+     * 'first' is runnable only if 'then' is both runnable and migratable,
+     * and 'first' becomes required if 'then' is
+     */
+    pcmk__ar_unmigratable_then_blocks       = (1U << 7),
+
+    //! 'then' is runnable (and migratable) only if 'first' is runnable
+    pcmk__ar_unrunnable_first_blocks        = (1U << 8),
+
+    //! If 'first' is unrunnable, 'then' becomes a real, unmigratable action
+    pcmk__ar_first_else_then                = (1U << 9),
+
+    //! If 'first' is required, 'then' action for instance on same node is
+    pcmk__ar_first_implies_same_node_then   = (1U << 10),
+
+    /*!
+     * Disable relation if 'first' is unrunnable and for an active resource,
+     * otherwise order actions and make 'then' unrunnable if 'first' is.
+     *
+     * This is used to order a bundle replica's start of its container before a
+     * probe of its remote connection resource, in case the connection uses the
+     * REMOTE_CONTAINER_HACK to replace the connection address with where the
+     * container is running.
+     */
+    pcmk__ar_nested_remote_probe            = (1U << 11),
+
+    /*!
+     * If 'first' is for a blocked resource, make 'then' unrunnable.
+     *
+     * If 'then' is required, make 'first' required, make 'first' unmigratable
+     * if 'then' is unmigratable, and make 'then' unrunnable if 'first' is
+     * unrunnable.
+     *
+     * If 'then' is unrunnable and for the same resource as 'first', make
+     * 'first' required if it is runnable, and make 'first' unmigratable if
+     * 'then' is unmigratable.
+     *
+     * This is used for "stop then start primitive" (restarts) and
+     * "stop group member then stop previous member".
+     */
+    pcmk__ar_intermediate_stop              = (1U << 12),
+
+    /*!
+     * The actions must be serialized if in the same transition but can be in
+     * either order. (In practice, we always arrange them as 'first' then
+     * 'then', so they end up being essentially the same as optional orderings.)
+     *
+     * @TODO Handle more intelligently -- for example, we could schedule the
+     * action with the fewest inputs first, so we're more likely to execute at
+     * least one if there is a failure during the transition. Or, we could
+     * prefer certain action types over others, or base it on resource priority.
+     */
+    pcmk__ar_serialize                      = (1U << 14),
+
+    //! Relation applies only if actions are on same node
+    pcmk__ar_if_on_same_node                = (1U << 15),
+
+    //! If 'then' is required, 'first' must be added to the transition graph
+    pcmk__ar_then_implies_first_graphed     = (1U << 16),
+
+    //! If 'first' is required and runnable, 'then' must be in graph
+    pcmk__ar_first_implies_then_graphed     = (1U << 17),
+
+    //! User-configured asymmetric ordering
+    pcmk__ar_asymmetric                     = (1U << 20),
+
+    //! Actions are ordered if on same node (or migration target for migrate_to)
+    pcmk__ar_if_on_same_node_or_target      = (1U << 21),
+
+    //! 'then' action is runnable if certain number of 'first' instances are
+    pcmk__ar_min_runnable                   = (1U << 22),
+
+    //! Ordering applies only if 'first' is required and on same node as 'then'
+    pcmk__ar_if_required_on_same_node       = (1U << 23),
+
+    //! Ordering applies even if 'first' runs on guest node created by 'then'
+    pcmk__ar_guest_allowed                  = (1U << 24),
+
+    //! If 'then' action becomes required, 'first' becomes optional
+    pcmk__ar_then_cancels_first             = (1U << 25),
+};
+
+typedef struct pe_action_wrapper_s pcmk__related_action_t;
+
+#endif      // PCMK__CRM_COMMON_ACTION_RELATION_INTERNAL__H