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+/* PSPP - a program for statistical analysis.
+   Copyright (C) 2010 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 DATA_MRSET_H
+#define DATA_MRSET_H 1
+
+/* Multiple response set data structure.
+
+   A multiple response set (mrset) is a set of variables that represent
+   multiple responses to a single survey question in one of the two following
+   ways:
+
+     - A multiple dichotomy set represents a survey question with a set of
+       checkboxes.  Each variable in the set is treated in a Boolean fashion:
+       one value (the "counted value") means that the box was checked, and any
+       other value means that it was not.
+
+     - A multiple category set represents a survey question where the
+       respondent is instructed to "list up to N choices".  Each variable
+       represents one of the responses.
+
+   The set of functions provided here are skeletal.  Undoubtedly they will grow
+   as PSPP begins to make use of multiple response sets, as opposed to merely
+   maintaining them as part of the dictionary.
+ */
+
+#include <stdbool.h>
+#include <stddef.h>
+
+#include "data/value.h"
+
+struct dictionary;
+
+/* Type of a multiple response set. */
+enum mrset_type
+  {
+    MRSET_MD,                   /* Multiple dichotomy group. */
+    MRSET_MC                    /* Multiple category group. */
+  };
+
+/* Source of category labels for a multiple dichotomy group. */
+enum mrset_md_cat_source
+  {
+    MRSET_VARLABELS,            /* Variable labels. */
+    MRSET_COUNTEDVALUES         /* Value labels for the counted value. */
+  };
+
+/* A multiple response set. */
+struct mrset
+  {
+    char *name;                 /* Name for syntax.  Always begins with "$". */
+    char *label;                /* Human-readable label for group. */
+    enum mrset_type type;       /* Group type. */
+    struct variable **vars;     /* Constituent variables. */
+    size_t n_vars;              /* Number of constituent variables. */
+
+    /* MRSET_MD only. */
+    enum mrset_md_cat_source cat_source; /* Source of category labels. */
+    bool label_from_var_label;  /* 'label' taken from variable label? */
+    union value counted;        /* Counted value. */
+    int width;                  /* Width of 'counted'. */
+  };
+
+struct mrset *mrset_clone (const struct mrset *);
+void mrset_destroy (struct mrset *);
+
+bool mrset_ok (const struct mrset *, const struct dictionary *);
+
+#endif /* data/mrset.h */