@@ -0,0 +1,17 @@
+---
+'@objectstack/spec': minor
+'@objectstack/metadata-protocol': patch
+'@objectstack/cloud-connection': patch
+---
+
+feat(metadata-protocol,cloud-connection): an unmanaged install can take a target namespace
+
+Clause-②: yes (widening)
+Metadata-protocol: added
+
+- **An unmanaged copy can be installed under a namespace of its own.** `importUnmanagedPackage` and `POST /api/v1/marketplace/install-local` (with `installMode: 'unmanaged'`) take an optional `targetNamespace`. The copy's base takes it as its `namespace`, every copied object name takes it in place of the package's (a name without the package's prefix takes it in front), and every reference to a renamed name follows. Absent, the copy keeps the package's namespace exactly as before.
+- **One rename, two doors.** The copy is renamed by the rules `duplicatePackage` already applies, now one function both doors call: view items and view containers follow their object, translations are named `<targetNamespace>_<locale>` with the object keys inside them renamed, a field keeps its key, and free text is renamed only at a whole prefixed object name.
+- **Refused before anything is installed.** A `targetNamespace` the `manifest.namespace` rule refuses, or a platform-reserved one (`base`, `system`, `sys`), answers `400 INVALID_REQUEST`. So does a copy the names cannot make: an object whose copy name another object's copy takes, a copy name that is not a legal item name or is longer than its storage allows (63 characters for an object's table, 255 for an item name), and a renamed key that meets a key the item already holds — each item named. The same-name check (`409 RESOURCE_CONFLICT`) is judged on the renamed names, and a `targetNamespace` another package owns is refused `409`.
+- **A managed install is never renamed.** `targetNamespace` beside a managed install (or no `installMode`) answers `400 INVALID_REQUEST` before anything is fetched.
+- **The rename is recorded.** The import's answer carries `sourceNamespace`, and the install-local answer's `installedFrom` carries the package's own `namespace` beside its id and version. Neither appears when the copy kept the package's namespace.
+- **A bare object's view container follows it on a duplicate too.** A view named by an object of the package takes that object's copy name, so `duplicatePackage` no longer leaves a bare object's container under the name the source's container holds.
@@ -92,6 +92,7 @@ runtime installs managed. The door judges the mode before it writes anything:
 | A mode the package's `installModes` does not permit | `422 INSTALL_MODE_NOT_PERMITTED`, naming what it permits |
 | `unmanaged` on a deployment whose requested tenancy posture walls organizations (`group`, `isolated`) | `409 UNMANAGED_INSTALL_WALLED_POSTURE`, naming the posture |
 | `managed`, while an unmanaged copy of the package holds its namespace | `409 RESOURCE_CONFLICT`, naming the copy's base |
+| `targetNamespace` on a `managed` install, or with no `installMode` | `400 INVALID_REQUEST`: a managed install is never renamed |
 
 A runtime that predates install modes ignores the field and installs the
 package managed. If you asked for `unmanaged`, the CLI says so and exits `1`.
@@ -144,7 +145,8 @@ delete, and `full` both.
 ## What an unmanaged copy keeps, and what it drops
 
 The package's metadata is copied **once** into a new writable base,
-`<package id>-copy`, which keeps the package's namespace. Every item is written
+`<package id>-copy`, which keeps the package's namespace unless the install
+[names another](#installing-the-copy-under-a-namespace-of-its-own). Every item is written
 through the save door a Studio edit takes, environment-wide, and is served as
 environment-authored metadata: the next save edits it.
 
@@ -215,6 +217,51 @@ dash and reason left off when there is none:
 
 Read it before you edit: it is why the vendor locked each item.
 
+### Installing the copy under a namespace of its own
+
+An unmanaged install can rename the copy into a namespace you name, so it sits
+beside the package, or beside another copy of it, under names of its own. Send
+`targetNamespace` with `installMode: 'unmanaged'` in the body of
+`POST /api/v1/marketplace/install-local` (the CLI has no flag for it):
+
+```json
+{ "packageId": "com.acme.crm", "versionId": "1.2.0", "installMode": "unmanaged", "targetNamespace": "acme" }
+```
+
+The copy is renamed by the same rules as duplicating a package:
+
+- **Every object takes the new namespace.** `crm_lead` copies as `acme_lead`,
+  and an object whose name lacks the package's prefix takes the new one in
+  front (`ticket` copies as `acme_ticket`).
+- **What names an object follows it.** A lookup's `reference`, a view's
+  `object`, a permission set's `objects` keys and the object part of its
+  `fields` keys, a translation's object keys, a form action's view target.
+  A view item follows its object (`crm_lead.board` copies as
+  `acme_lead.board`), and so does a view container and every view it expands
+  into. A field keeps its key, and a word in free text is renamed only when it
+  is a whole prefixed object name (`crm_lead`, never `x_crm_lead`).
+- **Translations are named `acme_<locale>`**, with the object keys inside them
+  renamed.
+- **An object of another package keeps its name**, and so do its view items.
+
+`targetNamespace` follows the rule for a manifest `namespace`, and the
+platform's shared namespaces `base`, `system` and `sys` are refused. Every
+refusal is answered before the base exists, so nothing is installed:
+
+| The rename | The answer |
+|:---|:---|
+| A `targetNamespace` the namespace rule refuses, or a shared one | `400 INVALID_REQUEST`, naming `targetNamespace` |
+| An object whose copy name another object's copy takes (`ticket` beside `crm_ticket`) | `400 INVALID_REQUEST`, naming the object and the rename that clears it |
+| A copy name that is not a legal item name, longer than an object's table name may be (63 characters), or longer than an item name may be (255) | `400 INVALID_REQUEST`, naming each item |
+| A renamed key that meets a key the item already holds (a permission set granting both `crm_lead` and `acme_lead`) | `400 INVALID_REQUEST`, naming the item and both keys |
+| A renamed name the environment or a managed package already holds | `409 RESOURCE_CONFLICT`, naming each |
+| A `targetNamespace` another package owns | `409 RESOURCE_CONFLICT`, naming it |
+
+The install answer's `installedFrom` gains `namespace`, the package's own,
+beside its id and version, so the answer records the rename it applied: names
+in `installedFrom.namespace` were copied into the copy's `namespace`. Without
+`targetNamespace` the answer is unchanged.
+
 ---
 
 ## Choosing what to permit
 
@@ -246,6 +246,7 @@ A navigation item another installed package contributes to an app the base owns,
 | **manifest** | `Record<string, any>` | ✅ | The package to import: ONE package's assembled body, flattened — its manifest fields beside its metadata collections (`objects`, `views`, …), the shape the install door hands the manifest service. An artifact carrying `packages` is refused: import each package body on its own. |
 | **targetPackageId** | `string` | optional | Id of the NEW writable base the items are written into, in reverse-domain form. It must differ from the source id and name no installed package. Defaults to `<manifest.id>-copy`. |
 | **targetName** | `string` | optional | Display name of the new base. Defaults to the source package's `name`. |
+| **targetNamespace** | `string` | optional | The namespace the copy is renamed into: the new base's `namespace`, and the prefix every copied object name takes in place of the source's, with every reference to a renamed name rewritten (the rename `duplicatePackage` applies). Judged by `manifest.namespace`'s own declaration; a platform-reserved namespace (`base`, `system`, `sys`) is refused. Absent, the copy keeps the source package's namespace. |
 
 
 ---
@@ -259,7 +260,8 @@ A navigation item another installed package contributes to an app the base owns,
 | **sourcePackageId** | `string` | ✅ | The id of the package the items were copied from. |
 | **sourceVersion** | `string` | optional | The version the imported body declared, when it declared one. |
 | **targetPackageId** | `string` | ✅ | The new writable base that owns every copied item. Nothing is registered under the source id. |
-| **namespace** | `string` | ✅ | The base's namespace — the SOURCE package's, kept so every copied object name stays valid. |
+| **namespace** | `string` | ✅ | The base's namespace — the request's `targetNamespace` when it named one, else the SOURCE package's, kept so every copied object name stays valid. |
+| **sourceNamespace** | `string` | optional | The SOURCE package's namespace, present when the copy was renamed into `namespace` — the provenance of every copied name. Absent when the copy kept the source's namespace. |
 | **copiedCount** | `number` | ✅ | How many items were copied. |
 | **copied** | `{ type: string; name: string }[]` | ✅ | Every item that was copied, in the order it was written. |
 | **strippedLocks** | `{ type: string; name: string; lock: Enum<'no-overlay' \| 'no-delete' \| 'full'>; reason?: string }[]` | ✅ | Every protection lock the package shipped on a copied item and the copy does not keep, in the order the items were written. Empty when the package locked nothing. |
 
@@ -506,3 +506,64 @@ describe('[#23914] a truncated install body is refused, and nothing is written',
         expect(empty.payload).toEqual(none.payload);
     });
 });
+
+describe('install-local — `targetNamespace` renames an unmanaged copy, and only an unmanaged one (#30794)', () => {
+    /** The import as it answers a renamed copy: the request's namespace, and the source's beside it. */
+    const renamingImporter = async (request: any) => ({
+        sourcePackageId: request.manifest.id,
+        sourceVersion: request.manifest.version,
+        targetPackageId: `${request.manifest.id}-copy`,
+        namespace: request.targetNamespace ?? request.manifest.namespace,
+        ...(request.targetNamespace !== undefined ? { sourceNamespace: request.manifest.namespace } : {}),
+        copiedCount: 1,
+        copied: [{ type: 'object', name: `${request.targetNamespace ?? request.manifest.namespace}_lead` }],
+        strippedLocks: [],
+    });
+
+    it('hands `targetNamespace` to the import, and records the source namespace beside `installedFrom`', async () => {
+        const h = await mount(dir, { importer: renamingImporter });
+        const res = await h.install({ manifest: crm({ installModes: BOTH }), installMode: 'unmanaged', targetNamespace: 'acme' });
+        expect(res.status, JSON.stringify(res.payload)).toBe(200);
+
+        expect(h.importUnmanagedPackage).toHaveBeenCalledTimes(1);
+        expect(h.importUnmanagedPackage!.mock.calls[0]![0]).toMatchObject({ targetNamespace: 'acme', actor: INSTALLER });
+        // The mapping the rename applied: `installedFrom.namespace` → `namespace`.
+        expect(res.payload.data).toMatchObject({
+            installMode: 'unmanaged',
+            namespace: 'acme',
+            installedFrom: { packageId: 'com.example.crm', version: '4.0.0', namespace: 'crm' },
+            copied: [{ type: 'object', name: 'acme_lead' }],
+        });
+        const info = h.logger.info.mock.calls.map((call: any[]) => String(call[0])).join('\n');
+        expect(info).toContain("(namespace 'acme', renamed from 'crm')");
+    });
+
+    it('without it the import is asked as before, and `installedFrom` carries no namespace — the key set unchanged', async () => {
+        const h = await mount(dir, { importer: renamingImporter });
+        const res = await h.install({ manifest: crm({ installModes: BOTH }), installMode: 'unmanaged' });
+        expect(res.status).toBe(200);
+        expect(h.importUnmanagedPackage!.mock.calls[0]![0]).not.toHaveProperty('targetNamespace');
+        expect(res.payload.data.installedFrom).toEqual({ packageId: 'com.example.crm', version: '4.0.0' });
+    });
+
+    for (const installMode of [undefined, 'managed'] as const) {
+        it(`beside a ${installMode ?? 'default (managed)'} install: 400 INVALID_REQUEST — a managed install is never renamed; nothing fetched or written`, async () => {
+            const h = await mount(dir, { importer: renamingImporter });
+            const fetchSpy = vi.fn();
+            vi.stubGlobal('fetch', fetchSpy);
+            const res = await h.install({
+                manifest: crm({ installModes: BOTH }),
+                ...(installMode ? { installMode } : {}),
+                targetNamespace: 'acme',
+            });
+            expect(res.status).toBe(400);
+            expect(res.payload.error.code).toBe('INVALID_REQUEST');
+            expect(res.payload.error.message).toContain('a managed install is never renamed');
+            expect(fetchSpy).not.toHaveBeenCalled();
+            expect(h.importUnmanagedPackage).not.toHaveBeenCalled();
+            expect(h.register).not.toHaveBeenCalled();
+            expect(h.syncSchemas).not.toHaveBeenCalled();
+            expect(h.ledgerHas('com.example.crm')).toBe(false);
+        });
+    }
+});
@@ -73,6 +73,14 @@
  *              payload check, step 1b (package id), the ADR-0131 D3
  *              walled-catalog refusal and step 1c (protocol handshake),
  *              none of which writes, and before any write.
+ *              [#30794] `targetNamespace` (optional) renames the copy into
+ *              a namespace of its own — the import's rename-on-install:
+ *              every copied object name takes it, every reference follows,
+ *              and the answer's `installedFrom.namespace` records the
+ *              source's. Absent, the copy keeps the package's namespace.
+ *          `targetNamespace` beside a `managed` install (or no `installMode`)
+ *          answers `400 INVALID_REQUEST` before anything is fetched: a
+ *          managed install is never renamed, it keeps its upgrade channel.
  *          A mode the package's `installModes` does not permit answers
  *          `422 INSTALL_MODE_NOT_PERMITTED`, before any write.
  *          Either mode reads the body's `withheldMaps` — the connector header
@@ -1841,6 +1849,25 @@ export class MarketplaceInstallLocalPlugin implements Plugin {
             }, 400);
         }
 
+        // 0″. [#30794] ⭐ RENAME-ON-INSTALL IS UNMANAGED ONLY. A `targetNamespace`
+        //     renames the copy an `unmanaged` install writes; a MANAGED install
+        //     is the package itself, registered under the namespace it ships
+        //     and upgraded through it, so it is never renamed — refused here,
+        //     before the cloud round-trip, never ignored. The value itself is
+        //     judged by the import, against the manifest key's own declaration.
+        const targetNamespace: unknown = body?.targetNamespace;
+        if (targetNamespace !== undefined && installMode !== 'unmanaged') {
+            return c.json({
+                success: false,
+                error: {
+                    code: 'INVALID_REQUEST',
+                    message: '`targetNamespace` renames an unmanaged copy, and this install is managed: a managed install '
+                        + 'is never renamed — it keeps the package\'s namespace and its upgrade channel. Install with '
+                        + '`installMode: \'unmanaged\'` to take a copy under a namespace of its own, or omit `targetNamespace`.',
+                },
+            }, 400);
+        }
+
         // ── Offline path: an inline manifest was supplied (file import). ──
         // Bypass the cloud-fetch entirely; no OS_CLOUD_URL required.
         const inlineManifest = body?.manifest && typeof body.manifest === 'object' ? body.manifest : null;
@@ -2233,6 +2260,7 @@ export class MarketplaceInstallLocalPlugin implements Plugin {
                 userId,
                 withheldMaps,
                 protocolCheckSkipped,
+                ...(targetNamespace !== undefined ? { targetNamespace } : {}),
             });
         }
 
@@ -4007,9 +4035,11 @@ export class MarketplaceInstallLocalPlugin implements Plugin {
             withheldMaps: readonly WithheldMap[];
             /** [#30326] The handshake admitted the package unchecked ({@link protocolCheckSkippedOf}). */
             protocolCheckSkipped: ProtocolCheckSkipped | undefined;
+            /** [#30794] The namespace the copy is renamed into, as the request wrote it; the import judges it. */
+            targetNamespace?: unknown;
         },
     ): Promise<Response> => {
-        const { manifest, manifestId, version, versionId, userId, withheldMaps, protocolCheckSkipped } = args;
+        const { manifest, manifestId, version, versionId, userId, withheldMaps, protocolCheckSkipped, targetNamespace } = args;
         let protocol: UnmanagedImporter | undefined;
         try { protocol = ctx.getService<UnmanagedImporter>('protocol'); } catch { /* no protocol service */ }
         if (!protocol || typeof protocol.importUnmanagedPackage !== 'function') {
@@ -4029,6 +4059,7 @@ export class MarketplaceInstallLocalPlugin implements Plugin {
         try {
             result = await protocol.importUnmanagedPackage({
                 manifest: packageBody,
+                ...(targetNamespace !== undefined ? { targetNamespace } : {}),
                 ...(userId ? { actor: userId } : {}),
             } as Parameters<NonNullable<UnmanagedImporter['importUnmanagedPackage']>>[0]);
         } catch (err: any) {
@@ -4059,13 +4090,20 @@ export class MarketplaceInstallLocalPlugin implements Plugin {
             }, resolved.status as any);
         }
 
+        // [#30794] A renamed copy's provenance carries the namespace its names
+        // came from beside the package and version: `installedFrom.namespace`
+        // → the answer's `namespace` is the mapping the rename applied.
+        // Omitted when the copy kept the source's namespace, so that answer's
+        // key set is unchanged.
         const installedFrom = {
             packageId: result.sourcePackageId,
             ...(result.sourceVersion !== undefined ? { version: result.sourceVersion } : {}),
+            ...(result.sourceNamespace !== undefined ? { namespace: result.sourceNamespace } : {}),
         };
         ctx.logger?.info?.(
             `[MarketplaceInstallLocal] installed ${manifestId} unmanaged: ${result.copiedCount} item(s) copied into the `
-            + `environment base '${result.targetPackageId}' (namespace '${result.namespace}'), installed from `
+            + `environment base '${result.targetPackageId}' (namespace '${result.namespace}'`
+            + `${result.sourceNamespace !== undefined ? `, renamed from '${result.sourceNamespace}'` : ''}), installed from `
             + `${installedFrom.packageId}${installedFrom.version ? `@${installedFrom.version}` : ''}`
             + `${userId ? ` by ${userId}` : ''}. Nothing is registered under '${manifestId}'; the copy follows no upgrade.`,
         );