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diff --git a/include/crm/common/nodes.h b/include/crm/common/nodes.h
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@@ -0,0 +1,144 @@
+/*
+ * Copyright 2004-2023 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_NODES__H
+#  define PCMK__CRM_COMMON_NODES__H
+
+#include <glib.h>                       // gboolean, GList, GHashTable
+
+#include <crm/common/scheduler_types.h> // pcmk_resource_t, pcmk_scheduler_t
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*!
+ * \file
+ * \brief Scheduler API for nodes
+ * \ingroup core
+ */
+
+// Special node attributes
+
+#define PCMK_NODE_ATTR_TERMINATE    "terminate"
+
+
+//! Possible node types
+enum node_type {
+    pcmk_node_variant_cluster  = 1,     //!< Cluster layer node
+    pcmk_node_variant_remote   = 2,     //!< Pacemaker Remote node
+
+    node_ping   = 0,      //!< \deprecated Do not use
+#if !defined(PCMK_ALLOW_DEPRECATED) || (PCMK_ALLOW_DEPRECATED == 1)
+    //! \deprecated Use pcmk_node_variant_cluster instead
+    node_member = pcmk_node_variant_cluster,
+
+    //! \deprecated Use pcmk_node_variant_remote instead
+    node_remote = pcmk_node_variant_remote,
+#endif
+};
+
+//! When to probe a resource on a node (as specified in location constraints)
+enum pe_discover_e {
+    pcmk_probe_always       = 0,    //! Always probe resource on node
+    pcmk_probe_never        = 1,    //! Never probe resource on node
+    pcmk_probe_exclusive    = 2,    //! Probe only on designated nodes
+
+#if !defined(PCMK_ALLOW_DEPRECATED) || (PCMK_ALLOW_DEPRECATED == 1)
+    //! \deprecated Use pcmk_probe_always instead
+    pe_discover_always      = pcmk_probe_always,
+
+    //! \deprecated Use pcmk_probe_never instead
+    pe_discover_never       = pcmk_probe_never,
+
+    //! \deprecated Use pcmk_probe_exclusive instead
+    pe_discover_exclusive   = pcmk_probe_exclusive,
+#endif
+};
+
+//! Basic node information (all node objects for the same node share this)
+struct pe_node_shared_s {
+    const char *id;             //!< Node ID at the cluster layer
+    const char *uname;          //!< Node name in cluster
+    enum node_type type;        //!< Node variant
+
+    // @TODO Convert these into a flag group
+    gboolean online;            //!< Whether online
+    gboolean standby;           //!< Whether in standby mode
+    gboolean standby_onfail;    //!< Whether in standby mode due to on-fail
+    gboolean pending;           //!< Whether controller membership is pending
+    gboolean unclean;           //!< Whether node requires fencing
+    gboolean unseen;            //!< Whether node has never joined cluster
+    gboolean shutdown;          //!< Whether shutting down
+    gboolean expected_up;       //!< Whether expected join state is member
+    gboolean is_dc;             //!< Whether node is cluster's DC
+    gboolean maintenance;       //!< Whether in maintenance mode
+    gboolean rsc_discovery_enabled; //!< Whether probes are allowed on node
+
+    /*!
+     * Whether this is a guest node whose guest resource must be recovered or a
+     * remote node that must be fenced
+     */
+    gboolean remote_requires_reset;
+
+    /*!
+     * Whether this is a Pacemaker Remote node that was fenced since it was last
+     * connected by the cluster
+     */
+    gboolean remote_was_fenced;
+
+    /*!
+     * Whether this is a Pacemaker Remote node previously marked in its
+     * node state as being in maintenance mode
+     */
+    gboolean remote_maintenance;
+
+    gboolean unpacked;              //!< Whether node history has been unpacked
+
+    /*!
+     * Number of resources active on this node (valid after CIB status section
+     * has been unpacked, as long as pcmk_sched_no_counts was not set)
+     */
+    int num_resources;
+
+    //! Remote connection resource for node, if it is a Pacemaker Remote node
+    pcmk_resource_t *remote_rsc;
+
+    GList *running_rsc;             //!< List of resources active on node
+    GList *allocated_rsc;           //!< List of resources assigned to node
+    GHashTable *attrs;              //!< Node attributes
+    GHashTable *utilization;        //!< Node utilization attributes
+    GHashTable *digest_cache;       //!< Cache of calculated resource digests
+
+    /*!
+     * Sum of priorities of all resources active on node and on any guest nodes
+     * connected to this node, with +1 for promoted instances (used to compare
+     * nodes for priority-fencing-delay)
+     */
+    int priority;
+
+    pcmk_scheduler_t *data_set;     //!< Cluster that node is part of
+};
+
+//! Implementation of pcmk_node_t
+struct pe_node_s {
+    int weight;         //!< Node score for a given resource
+    gboolean fixed;     //!< \deprecated Do not use
+    int count;          //!< Counter reused by assignment and promotion code
+    struct pe_node_shared_s *details;   //!< Basic node information
+
+    // @COMPAT This should be enum pe_discover_e
+    int rsc_discover_mode;              //!< Probe mode (enum pe_discover_e)
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // PCMK__CRM_COMMON_NODES__H