* An ident represents an unique string. The == operator
* is sufficient to compare two idents.
*/
-typedef const struct set_entry ident;
+#ifndef _IDENT_TYPEDEF_
+#define _IDENT_TYPEDEF_
+typedef const struct s_ident ident;
+#endif
+
+/**
+ * The ident module interface.
+ */
+typedef struct _ident_if_t {
+ /**
+ * Store a string and create an ident.
+ * This function may be NULL, new_id_from_chars()
+ * is then used to emulate it's behavior.
+ *
+ * @param str - the string which shall be stored
+ */
+ ident *(*new_id_from_str)(void *handle, const char *str);
+
+ /**
+ * Store a string and create an ident.
+ *
+ * @param str - the string (or whatever) which shall be stored
+ * @param len - the length of the data in bytes
+ */
+ ident *(*new_id_from_chars)(void *handle, const char *str, int len);
+
+ /**
+ * Returns a string represented by an ident.
+ */
+ const char *(*get_id_str)(void *handle, ident *id);
+
+ /**
+ * Returns the length of the string represented by an ident.
+ * This function may be NULL, get_id_str() is then used
+ * to emulate it's behavior.
+ *
+ * @param id - the ident
+ */
+ int (*get_id_strlen)(void *handle, ident *id);
+
+ /**
+ * Finish the ident module and frees all idents, may be NULL.
+ */
+ void (*finish_ident)(void *handle);
+
+ /** The handle. */
+ void *handle;
+
+} ident_if_t;
/**
* Store a string and create an ident.