diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/Module.kt b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/Module.kt
new file mode 100644
index 0000000..07164c6
--- /dev/null
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/Module.kt
@@ -0,0 +1,7 @@
+package ru.landgrafhomyak.serdha.api.v0.ddl
+
+public interface Module<W : Any> {
+	public val wrapper: W
+
+	public val versionKey: String
+}
\ No newline at end of file
diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/ModuleModifyingRound.kt b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/ModuleModifyingRound.kt
new file mode 100644
index 0000000..4d4bccb
--- /dev/null
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/ModuleModifyingRound.kt
@@ -0,0 +1,52 @@
+package ru.landgrafhomyak.serdha.api.v0.ddl
+
+import ru.landgrafhomyak.serdha.api.v0.dml.Insert
+import ru.landgrafhomyak.serdha.api.v0.dml.InsertCreator
+import ru.landgrafhomyak.serdha.api.v0.dml.Select
+import ru.landgrafhomyak.serdha.api.v0.dml.SelectCreator
+import ru.landgrafhomyak.serdha.api.v0.dml.Update
+import ru.landgrafhomyak.serdha.api.v0.dml.UpdateCreator
+
+public interface ModuleModifyingRound {
+	public fun <TableUserWrapper : Any> createTable(
+		namespace: Namespace,
+		name: String,
+		initializer: (TableCreator<TableUserWrapper>) -> TableUserWrapper
+	): Table<TableUserWrapper, Nothing>
+
+	public fun <TableNewUserWrapper : Any, TableOldUserWrapper : Any> updateTable(
+		oldTable: Table<TableOldUserWrapper, *>,
+		initializer: (TableUpdater<TableNewUserWrapper, TableOldUserWrapper>) -> TableNewUserWrapper
+	): Table<TableNewUserWrapper, TableOldUserWrapper>
+
+	public fun <TableNewUserWrapper : Any, TableOldUserWrapper : Any> renameTable(
+		table: Table<TableNewUserWrapper, TableOldUserWrapper>,
+		newName: String
+	): Table<TableNewUserWrapper, TableOldUserWrapper>
+
+	public fun <TableNewUserWrapper : Any, TableOldUserWrapper : Any> renameTable(
+		table: Table<TableNewUserWrapper, TableOldUserWrapper>,
+		newNamespace: Namespace,
+		newName: String
+	): Table<TableNewUserWrapper, TableOldUserWrapper>
+
+	public fun <TableNewUserWrapper : Any, TableOldUserWrapper : Any> updateAndRenameTable(
+		table: Table<TableOldUserWrapper, *>,
+		newName: String,
+		initializer: (TableUpdater<TableNewUserWrapper, TableOldUserWrapper>) -> TableNewUserWrapper
+	): Table<TableNewUserWrapper, TableOldUserWrapper>
+
+	public fun <TableNewUserWrapper : Any, TableOldUserWrapper : Any> updateAndRenameTable(
+		table: Table<TableNewUserWrapper, TableOldUserWrapper>,
+		newNamespace: Namespace,
+		newName: String,
+		initializer: (TableUpdater<TableNewUserWrapper, TableOldUserWrapper>) -> TableNewUserWrapper
+	): Table<TableNewUserWrapper, TableOldUserWrapper>
+
+	public fun <QueryUserWrapper : Any> createSelect(initializer: (SelectCreator<QueryUserWrapper>) -> QueryUserWrapper): Select<QueryUserWrapper>
+	public fun <TableUserWrapper : Any, QueryUserWrapper : Any> createInsert(table: Table<TableUserWrapper, *>, initializer: (InsertCreator<TableUserWrapper, QueryUserWrapper>) -> QueryUserWrapper): Insert<QueryUserWrapper>
+	public fun <TableUserWrapper : Any, QueryUserWrapper : Any> createUpdate(table: Table<TableUserWrapper, *>, initializer: (UpdateCreator<TableUserWrapper, QueryUserWrapper>) -> QueryUserWrapper): Update<QueryUserWrapper>
+
+	public fun <W : Any> substituteModule(rootNs: Namespace, template: ModuleTemplate<W>): Module<W>
+	public fun <W : Any> upgradeModule(oldModule: Module<*>, rootNs: Namespace, template: ModuleTemplate<W>): Module<W>
+}
\ No newline at end of file
diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/ModuleTemplate.kt b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/ModuleTemplate.kt
new file mode 100644
index 0000000..cba1ba6
--- /dev/null
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/ModuleTemplate.kt
@@ -0,0 +1,10 @@
+package ru.landgrafhomyak.serdha.api.v0.ddl
+
+public interface ModuleTemplate<W : Any> {
+	public fun <NW : Any> modify(
+		newVersionKey: String,
+		updater: (oldModule: ModuleTemplate<W>, rootNs: Namespace, updater: ModuleModifyingRound) -> NW
+	): ModuleTemplate<NW>
+
+	public val versionKey: String
+}
\ No newline at end of file
diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/Namespace.kt b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/Namespace.kt
new file mode 100644
index 0000000..af5011f
--- /dev/null
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/Namespace.kt
@@ -0,0 +1,10 @@
+package ru.landgrafhomyak.serdha.api.v0.ddl
+
+public interface Namespace {
+	@Suppress("SpellCheckingInspection")
+	public fun subnamespace(name: String): Namespace
+
+	public val name: String
+
+	public val path: List<String>
+}
\ No newline at end of file