diff --git a/mie/dialect/index/index-cache.c b/mie/dialect/index/index-cache.c
new file mode 100644
index 0000000..366fea6
--- /dev/null
+++ b/mie/dialect/index/index-cache.c
@@ -0,0 +1,82 @@
+#include <blue/core/btree.h>
+#include <mie/ctx.h>
+#include <mie/dialect/index.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct index_cache_entry {
+	b_btree_node e_node;
+	struct mie_index e_value;
+};
+
+struct mie_index_cache {
+	b_btree c_entries;
+};
+
+static B_BTREE_DEFINE_SIMPLE_INSERT(
+	struct index_cache_entry, e_node, e_value.i_value, put_index);
+static B_BTREE_DEFINE_SIMPLE_GET(
+	struct index_cache_entry, size_t, e_node, e_value.i_value, get_index);
+
+static struct index_cache_entry *index_cache_entry_create(
+	struct mie_ctx *ctx, size_t val)
+{
+	struct index_cache_entry *out = malloc(sizeof *out);
+	if (!out) {
+		return NULL;
+	}
+
+	out->e_value.i_value = val;
+	out->e_value.i_base.v_type = mie_ctx_get_type(ctx, "index", "index");
+	if (!out->e_value.i_base.v_type) {
+		free(out);
+		return NULL;
+	}
+
+	return out;
+}
+
+struct mie_index_cache *mie_index_cache_create(void)
+{
+	struct mie_index_cache *out = malloc(sizeof *out);
+	if (!out) {
+		return NULL;
+	}
+
+	memset(out, 0x0, sizeof *out);
+	return out;
+}
+
+void mie_index_cache_destroy(struct mie_index_cache *cache)
+{
+	b_btree_node *cur = b_btree_first(&cache->c_entries);
+	while (cur) {
+		b_btree_node *next = b_btree_next(cur);
+		b_btree_delete(&cache->c_entries, cur);
+
+		struct index_cache_entry *entry
+			= b_unbox(struct index_cache_entry, cur, e_node);
+		free(entry);
+
+		cur = next;
+	}
+
+	free(cache);
+}
+
+struct mie_index *mie_index_cache_get(
+	struct mie_index_cache *cache, struct mie_ctx *ctx, size_t value)
+{
+	struct index_cache_entry *entry = get_index(&cache->c_entries, value);
+	if (!entry) {
+		entry = index_cache_entry_create(ctx, value);
+
+		if (!entry) {
+			return NULL;
+		}
+
+		put_index(&cache->c_entries, entry);
+	}
+
+	return &entry->e_value;
+}
diff --git a/mie/dialect/index/index.c b/mie/dialect/index/index.c
new file mode 100644
index 0000000..8fbd76a
--- /dev/null
+++ b/mie/dialect/index/index.c
@@ -0,0 +1,50 @@
+#include <mie/dialect/dialect.h>
+#include <mie/dialect/index.h>
+#include <mie/dialect/type.h>
+#include <mie/macros.h>
+#include <mie/type/type.h>
+#include <mie/value.h>
+
+struct index_type {
+	struct mie_type i_base;
+};
+
+static void value_print(
+	const struct mie_type *ty, const struct mie_value *value, b_stream *out)
+{
+	struct index_type *index_ty = (struct index_type *)ty;
+	struct mie_index *index_val = (struct mie_index *)value;
+	b_stream_write_fmt(
+		out, NULL, "%zu : %s", index_val->i_value,
+		index_ty->i_base.ty_def->ty_name);
+}
+
+static void type_init(const struct mie_dialect_type *type_info, struct mie_type *type)
+{
+	type->ty_instance_size = sizeof(struct mie_index);
+	type->ty_value_print = value_print;
+}
+
+static enum mie_status print(
+	const struct mie_dialect_type *def, const struct mie_type *ty, b_stream *out)
+{
+	return MIE_SUCCESS;
+}
+
+static enum mie_status parse(
+	const struct mie_dialect_type *def, struct mie_parser *parser,
+	struct mie_type **out)
+{
+	return MIE_SUCCESS;
+}
+
+MIE_DIALECT_TYPE_BEGIN(mie_index_index, "index")
+	MIE_DIALECT_TYPE_STRUCT(struct index_type);
+	MIE_DIALECT_TYPE_INIT(type_init);
+	MIE_DIALECT_TYPE_PRINT(print);
+	MIE_DIALECT_TYPE_PARSE(parse);
+MIE_DIALECT_TYPE_END()
+
+MIE_DIALECT_BEGIN(mie_index, "index")
+	MIE_DIALECT_ADD_TYPE(mie_index_index);
+MIE_DIALECT_END()
diff --git a/mie/include/mie/dialect/index.h b/mie/include/mie/dialect/index.h
new file mode 100644
index 0000000..3a73cbb
--- /dev/null
+++ b/mie/include/mie/dialect/index.h
@@ -0,0 +1,26 @@
+#ifndef MIE_DIALECT_INDEX_H_
+#define MIE_DIALECT_INDEX_H_
+
+#include <mie/misc.h>
+#include <mie/value.h>
+#include <stddef.h>
+#include <stdint.h>
+
+struct mie_ctx;
+struct mie_dialect;
+
+struct mie_index {
+	struct mie_value i_base;
+	size_t i_value;
+};
+
+struct mie_index_cache;
+
+MIE_API struct mie_dialect *mie_index_dialect_create(struct mie_ctx *ctx);
+
+MIE_API struct mie_index_cache *mie_index_cache_create(void);
+MIE_API void mie_index_cache_destroy(struct mie_index_cache *cache);
+MIE_API struct mie_index *mie_index_cache_get(
+	struct mie_index_cache *cache, struct mie_ctx *ctx, size_t value);
+
+#endif