diff --git a/libasn1parser/asn1p_module.h b/libasn1parser/asn1p_module.h
new file mode 100644
index 0000000..906c784
--- /dev/null
+++ b/libasn1parser/asn1p_module.h
@@ -0,0 +1,88 @@
+/*
+ * A Module definition structure used by the ASN.1 parser.
+ */
+#ifndef	ASN1_PARSER_MODULE_H
+#define	ASN1_PARSER_MODULE_H
+
+/*
+ * Flags specific to a module.
+ */
+typedef enum asn1p_module_flags {
+	MSF_NOFLAGS,
+	MSF_EXPLICIT_TAGS		= 0x1,
+	MSF_IMPLICIT_TAGS		= 0x2,
+	MSF_AUTOMATIC_TAGS		= 0x4,
+	MSF_EXTENSIBILITY_IMPLIED	= 0x8,
+} asn1p_module_flags_e;
+
+/*
+ * === EXAMPLE ===
+ * MySyntax DEFINITIONS AUTOMATIC TAGS ::=
+ * BEGIN
+ * ...
+ * END
+ * === EOF ===
+ */
+typedef struct asn1p_module_s {
+
+	/*
+	 * Name of the source file.
+	 */
+	char *source_file_name;
+
+	/*
+	 * Human-readable module identifier.
+	 */
+	char *Identifier;		/* Module name */
+
+	/*
+	 * Unique module identifier, OID.
+	 */
+	asn1p_oid_t *module_oid;	/* Optional OID of the module */
+
+	/*
+	 * Module flags.
+	 */
+	asn1p_module_flags_e module_flags;	/* AUTOMATIC TAGS? */
+
+	/*
+	 * List of everything that this module IMPORTS.
+	 */
+	TQ_HEAD(struct asn1p_xports_s)	imports;
+
+	/*
+	 * List of everything that this module EXPORTS.
+	 */
+	TQ_HEAD(struct asn1p_xports_s)	exports;
+
+	/*
+	 * List of everything that this module defines itself.
+	 */
+	TQ_HEAD(struct asn1p_expr_s)	members;
+
+	/*
+	 * Next module in the list.
+	 */
+	TQ_ENTRY(struct asn1p_module_s)
+		mod_next;
+
+} asn1p_module_t;
+
+/*
+ * Constructor and destructor.
+ */
+asn1p_module_t *asn1p_module_new(void);
+void asn1p_module_free(asn1p_module_t *mod);
+
+/*
+ * No more than a container for several modules.
+ */
+typedef struct asn1p_s {
+	TQ_HEAD(struct asn1p_module_s)	modules;
+} asn1p_t;
+
+asn1p_t *asn1p_new(void);
+void asn1p_free(asn1p_t *asn);
+
+
+#endif	/* ASN1_PARSER_MODULE_H */