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diff --git a/src/output/spv/spvxml-helpers.h b/src/output/spv/spvxml-helpers.h
new file mode 100644
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+++ b/src/output/spv/spvxml-helpers.h
@@ -0,0 +1,126 @@
+/* PSPP - a program for statistical analysis.
+   Copyright (C) 2018 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>. */
+
+#ifndef SPVXML_HELPERS_H
+#define SPVXML_HELPERS_H 1
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <libxml/xmlreader.h>
+#include "libpspp/compiler.h"
+#include "libpspp/hmap.h"
+
+struct spvxml_node;
+
+struct spvxml_context
+  {
+    struct hmap id_map;
+
+    char *error;
+    bool hard_error;
+  };
+
+#define SPVXML_CONTEXT_INIT(CONTEXT) \
+  { HMAP_INITIALIZER ((CONTEXT).id_map), NULL, false }
+
+char *spvxml_context_finish (struct spvxml_context *, struct spvxml_node *root)
+  WARN_UNUSED_RESULT;
+
+struct spvxml_node_context
+  {
+    struct spvxml_context *up;
+    const xmlNode *parent;
+
+    struct spvxml_attribute *attrs;
+    size_t n_attrs;
+  };
+
+void spvxml_node_context_uninit (struct spvxml_node_context *);
+
+struct spvxml_node_class
+  {
+    const char *name;
+    void (*spvxml_node_free) (struct spvxml_node *);
+    void (*spvxml_node_collect_ids) (struct spvxml_context *,
+                                     struct spvxml_node *);
+    void (*spvxml_node_resolve_refs) (struct spvxml_context *,
+                                      struct spvxml_node *);
+  };
+
+struct spvxml_node
+  {
+    struct hmap_node id_node;
+    char *id;
+
+    const struct spvxml_node_class *class_;
+    const xmlNode *raw;
+  };
+
+void spvxml_node_collect_id (struct spvxml_context *, struct spvxml_node *);
+struct spvxml_node *spvxml_node_resolve_ref (
+  struct spvxml_context *, const xmlNode *, const char *attr_name,
+  const struct spvxml_node_class *const *, size_t n);
+
+/* Attribute parsing. */
+struct spvxml_attribute
+  {
+    const char *name;
+    bool required;
+    char *value;
+  };
+
+void spvxml_parse_attributes (struct spvxml_node_context *);
+void spvxml_attr_error (struct spvxml_node_context *, const char *format, ...)
+  PRINTF_FORMAT (2, 3);
+
+struct spvxml_enum
+  {
+    const char *name;
+    int value;
+  };
+
+int spvxml_attr_parse_enum (struct spvxml_node_context *,
+                            const struct spvxml_attribute *,
+                            const struct spvxml_enum[]);
+int spvxml_attr_parse_bool (struct spvxml_node_context *,
+                            const struct spvxml_attribute *);
+bool spvxml_attr_parse_fixed (struct spvxml_node_context *,
+                             const struct spvxml_attribute *,
+                             const char *attr_value);
+int spvxml_attr_parse_int (struct spvxml_node_context *,
+                           const struct spvxml_attribute *);
+int spvxml_attr_parse_color (struct spvxml_node_context *,
+                             const struct spvxml_attribute *);
+double spvxml_attr_parse_real (struct spvxml_node_context *,
+                               const struct spvxml_attribute *);
+double spvxml_attr_parse_dimension (struct spvxml_node_context *,
+                                    const struct spvxml_attribute *);
+struct spvxml_node *spvxml_attr_parse_ref (struct spvxml_node_context *,
+                                           const struct spvxml_attribute *);
+
+/* Content parsing. */
+
+void spvxml_content_error (struct spvxml_node_context *, const xmlNode *,
+                           const char *format, ...)
+  PRINTF_FORMAT (3, 4);
+bool spvxml_content_parse_element (struct spvxml_node_context *, xmlNode **,
+                                   const char *elem_name, xmlNode **);
+bool spvxml_content_parse_text (struct spvxml_node_context *, xmlNode **,
+                                char **textp);
+void spvxml_content_parse_etc (xmlNode **);
+bool spvxml_content_parse_end (struct spvxml_node_context *, xmlNode *);
+
+#endif /* output/spv/spvxml-helpers.h */