yuqi1129 commented on code in PR #6052:
URL: https://github.com/apache/gravitino/pull/6052#discussion_r1904036929


##########
docs/manage-model-metadata-using-gravitino.md:
##########
@@ -0,0 +1,637 @@
+---
+title: Manage model metadata using Gravitino
+slug: /manage-model-metadata-using-gravitino
+date: 2024-12-26
+keyword: Gravitino model metadata manage
+license: This software is licensed under the Apache License version 2.
+---
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+This page introduces how to manage model metadata in Apache Gravitino. 
Gravitino model catalog
+is a kind of model registry, which provides the ability to manage machine 
learning models'
+versioned metadata. It follows the typical Gravitino 3-level namespace 
(catalog, schema, and
+model) and supports managing the versions for each model.
+
+Currently, it supports model and model version registering, listing, loading, 
and deleting.
+
+To use the model catalog, please make sure that:
+
+ - The Gravitino server has started, and is serving at, e.g. 
[http://localhost:8090](http://localhost:8090).
+ - A metalake has been created and 
[enabled](./manage-metalake-using-gravitino.md#enable-a-metalake)
+
+## Catalog operations
+
+### Create a catalog
+
+:::info
+For a model catalog, you must specify the catalog `type` as `MODEL` when 
creating the catalog.
+Please also be aware that the `provider` is not required for a model catalog.
+:::
+
+You can create a catalog by sending a `POST` request to the 
`/api/metalakes/{metalake_name}/catalogs`
+endpoint or just use the Gravitino Java/Python client. The following is an 
example of creating a
+catalog:
+
+<Tabs groupId="language" queryString>
+<TabItem value="shell" label="Shell">
+
+```shell
+curl -X POST -H "Accept: application/vnd.gravitino.v1+json" \
+-H "Content-Type: application/json" -d '{
+  "name": "model_catalog",
+  "type": "MODEL",
+  "comment": "This is a model catalog",
+  "properties": {
+    "k1": "v1"
+  }
+}' http://localhost:8090/api/metalakes/example/catalogs
+```
+
+</TabItem>
+<TabItem value="java" label="Java">
+
+```java
+GravitinoClient gravitinoClient = GravitinoClient
+    .builder("http://localhost:8090";)
+    .withMetalake("example")
+    .build();
+
+Map<String, String> properties = ImmutableMap.<String, String>builder()
+    .put("k1", "v1")
+    .build();
+
+Catalog catalog = gravitinoClient.createCatalog(
+    "model_catalog",
+    Type.MODEL,
+    "This is a model catalog",
+    properties);
+```
+
+</TabItem>
+<TabItem value="python" label="Python">
+
+```python
+gravitino_client: GravitinoClient = 
GravitinoClient(uri="http://localhost:8090";, metalake_name="example")
+catalog = gravitino_client.create_catalog(name="catalog",

Review Comment:
   Please maintain consistency among the different languages. 



##########
docs/manage-model-metadata-using-gravitino.md:
##########
@@ -0,0 +1,637 @@
+---
+title: Manage model metadata using Gravitino
+slug: /manage-model-metadata-using-gravitino
+date: 2024-12-26
+keyword: Gravitino model metadata manage
+license: This software is licensed under the Apache License version 2.
+---
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+This page introduces how to manage model metadata in Apache Gravitino. 
Gravitino model catalog
+is a kind of model registry, which provides the ability to manage machine 
learning models'
+versioned metadata. It follows the typical Gravitino 3-level namespace 
(catalog, schema, and
+model) and supports managing the versions for each model.
+
+Currently, it supports model and model version registering, listing, loading, 
and deleting.
+
+To use the model catalog, please make sure that:
+
+ - The Gravitino server has started, and is serving at, e.g. 
[http://localhost:8090](http://localhost:8090).
+ - A metalake has been created and 
[enabled](./manage-metalake-using-gravitino.md#enable-a-metalake)
+
+## Catalog operations
+
+### Create a catalog
+
+:::info
+For a model catalog, you must specify the catalog `type` as `MODEL` when 
creating the catalog.
+Please also be aware that the `provider` is not required for a model catalog.
+:::
+
+You can create a catalog by sending a `POST` request to the 
`/api/metalakes/{metalake_name}/catalogs`
+endpoint or just use the Gravitino Java/Python client. The following is an 
example of creating a
+catalog:
+
+<Tabs groupId="language" queryString>
+<TabItem value="shell" label="Shell">
+
+```shell
+curl -X POST -H "Accept: application/vnd.gravitino.v1+json" \
+-H "Content-Type: application/json" -d '{
+  "name": "model_catalog",
+  "type": "MODEL",
+  "comment": "This is a model catalog",
+  "properties": {
+    "k1": "v1"
+  }
+}' http://localhost:8090/api/metalakes/example/catalogs
+```
+
+</TabItem>
+<TabItem value="java" label="Java">
+
+```java
+GravitinoClient gravitinoClient = GravitinoClient
+    .builder("http://localhost:8090";)
+    .withMetalake("example")
+    .build();
+
+Map<String, String> properties = ImmutableMap.<String, String>builder()
+    .put("k1", "v1")
+    .build();
+
+Catalog catalog = gravitinoClient.createCatalog(
+    "model_catalog",
+    Type.MODEL,
+    "This is a model catalog",
+    properties);
+```
+
+</TabItem>
+<TabItem value="python" label="Python">
+
+```python
+gravitino_client: GravitinoClient = 
GravitinoClient(uri="http://localhost:8090";, metalake_name="example")
+catalog = gravitino_client.create_catalog(name="catalog",
+                                          type=Catalog.Type.MODEL,
+                                          provider=None,
+                                          comment="This is a model catalog",
+                                          properties={"k1": "v1"})
+```
+
+</TabItem>
+</Tabs>
+
+### Load a catalog
+
+Refer to [Load a 
catalog](./manage-relational-metadata-using-gravitino.md#load-a-catalog)
+in relational catalog for more details. For a model catalog, the load 
operation is the same.
+
+### Alter a catalog
+
+Refer to [Alter a 
catalog](./manage-relational-metadata-using-gravitino.md#alter-a-catalog)
+in relational catalog for more details. For a model catalog, the alter 
operation is the same.
+
+### Drop a catalog
+
+Refer to [Drop a 
catalog](./manage-relational-metadata-using-gravitino.md#drop-a-catalog)
+in relational catalog for more details. For a model catalog, the drop 
operation is the same.
+
+### List all catalogs in a metalake
+
+Please refer to [List all catalogs in a 
metalake](./manage-relational-metadata-using-gravitino.md#list-all-catalogs-in-a-metalake)
+in relational catalog for more details. For a model catalog, the list 
operation is the same.
+
+### List all catalogs' information in a metalake
+
+Please refer to [List all catalogs' information in a 
metalake](./manage-relational-metadata-using-gravitino.md#list-all-catalogs-information-in-a-metalake)
+in relational catalog for more details. For a model catalog, the list 
operation is the same.
+
+## Schema operations
+
+`Schema` is a virtual namespace in a model catalog, which is used to organize 
the models. It
+is similar to the concept of `schema` in the relational catalog.
+
+:::tip
+Users should create a metalake and a catalog before creating a schema.
+:::
+
+### Create a schema
+
+You can create a schema by sending a `POST` request to the 
`/api/metalakes/{metalake_name}/catalogs/{catalog_name}/schemas`
+endpoint or just use the Gravitino Java/Python client. The following is an 
example of creating a
+schema:
+
+<Tabs groupId="language" queryString>
+<TabItem value="shell" label="Shell">
+
+```shell
+curl -X POST -H "Accept: application/vnd.gravitino.v1+json" \
+-H "Content-Type: application/json" -d '{
+  "name": "model_schema",
+  "comment": "This is a model schema",
+  "properties": {
+    "k1": "v1"
+  }
+}' http://localhost:8090/api/metalakes/example/catalogs/model_catalog/schemas
+```
+
+</TabItem>
+<TabItem value="java" label="Java">
+
+```java
+GravitinoClient gravitinoClient = GravitinoClient
+    .builder("http://localhost:8090";)
+    .withMetalake("example")
+    .build();
+
+Catalog catalog = gravitinoClient.loadCatalog("model_catalog");
+
+SupportsSchemas supportsSchemas = catalog.asSchemas();
+
+Map<String, String> schemaProperties = ImmutableMap.<String, String>builder()
+    .put("k1", "v1")
+    .build();
+Schema schema = supportsSchemas.createSchema(
+    "model_schema",
+    "This is a schema",
+    schemaProperties);
+// ...
+```
+
+</TabItem>
+<TabItem value="python" label="Python">
+
+```python
+gravitino_client: GravitinoClient = 
GravitinoClient(uri="http://localhost:8090";, metalake_name="example")
+
+catalog: Catalog = gravitino_client.load_catalog(name="model_catalog")
+catalog.as_schemas().create_schema(name="model_schema",
+                                   comment="This is a schema",
+                                   properties={"k1": "v1"})
+```
+
+</TabItem>
+</Tabs>
+
+### Load a schema
+
+Please refer to [Load a 
schema](./manage-relational-metadata-using-gravitino.md#load-a-schema)
+in relational catalog for more details. For a model catalog, the schema load 
operation is the
+same.
+
+### Alter a schema
+
+Please refer to [Alter a 
schema](./manage-relational-metadata-using-gravitino.md#alter-a-schema)
+in relational catalog for more details. For a model catalog, the schema alter 
operation is the
+same.
+
+### Drop a schema
+
+Please refer to [Drop a 
schema](./manage-relational-metadata-using-gravitino.md#drop-a-schema)
+in relational catalog for more details. For a model catalog, the schema drop 
operation is the
+same.
+
+Note that the drop operation will delete all the model metadata under this 
schema if `cascade`
+set to `true`.
+
+### List all schemas under a catalog
+
+Please refer to [List all schemas under a 
catalog](./manage-relational-metadata-using-gravitino.md#list-all-schemas-under-a-catalog)
+in relational catalog for more details. For a model catalog, the schema list 
operation is the
+same.
+
+## Model operations
+
+:::tip
+ - Users should create a metalake, a catalog, and a schema before creating a 
model.
+:::
+
+### Register a model
+
+You can register a model by sending a `POST` request to the 
`/api/metalakes/{metalake_name}
+/catalogs/{catalog_name}/schemas/{schema_name}/models` endpoint or just use 
the Gravitino
+Java/Python client. The following is an example of creating a model:
+
+<Tabs groupId="language" queryString>
+<TabItem value="shell" label="Shell">
+
+```shell
+curl -X POST -H "Accept: application/vnd.gravitino.v1+json" \
+-H "Content-Type: application/json" -d '{
+  "name": "example_model",
+  "comment": "This is an example model",
+  "properties": {
+    "k1": "v1"
+  }
+}' 
http://localhost:8090/api/metalakes/example/catalogs/model_catalog/schemas/model_schema/models
+```
+
+</TabItem>
+<TabItem value="java" label="Java">
+
+```java
+GravitinoClient gravitinoClient = GravitinoClient
+    .builder("http://localhost:8090";)
+    .withMetalake("example")
+    .build();
+
+Catalog catalog = gravitinoClient.loadCatalog("model_catalog");
+Map<String, String> propertiesMap = ImmutableMap.<String, String>builder()
+        .put("k1", "v1")
+        .build();
+
+Model = catalog.asModelCatalog().registerModel(
+    NameIdentifier.of("model_schema", "example_model"),
+    "This is an example model",
+    propertiesMap);
+```
+
+</TabItem>
+<TabItem value="python" label="Python">
+
+```python
+gravitino_client: GravitinoClient = 
GravitinoClient(uri="http://localhost:8090";, metalake_name="example")
+
+catalog: Catalog = gravitino_client.load_catalog(name="model_catalog")
+model = 
catalog.as_model_catalog().register_model(ident=NameIdentifier.of("model_schema",
 "example_model"),
+                                                  comment="This is an example 
model",
+                                                  properties={"k1": "v1"})
+```
+
+</TabItem>
+</Tabs>
+
+### Get a model
+
+You can get a model by sending a `GET` request to the 
`/api/metalakes/{metalake_name}
+/catalogs/{catalog_name}/schemas/{schema_name}/models/{model_name}` endpoint 
or by using the
+Gravitino Java/Python client. The following is an example of getting a model:
+
+<Tabs groupId="language" queryString>
+<TabItem value="shell" label="Shell">
+
+```shell
+curl -X GET -H "Accept: application/vnd.gravitino.v1+json" \
+-H "Content-Type: application/json" \
+http://localhost:8090/api/metalakes/example/catalogs/model_catalog/schemas/model_schema/models/example_model
+```
+
+</TabItem>
+<TabItem value="java" label="Java">
+
+```java
+// ...
+Catalog catalog = gravitinoClient.loadCatalog("model_catalog");
+Model model = 
catalog.asModelCatalog().getModel(NameIdentifier.of("model_schema", 
"example_model"));
+// ...
+```
+
+</TabItem>
+<TabItem value="python" label="Python">
+
+```python
+gravitino_client: GravitinoClient = 
GravitinoClient(uri="http://localhost:8090";, metalake_name="example")
+
+catalog: Catalog = gravitino_client.load_catalog(name="model_catalog")
+model: Model = 
catalog.as_model_catalog().get_model(ident=NameIdentifier.of("model_schema", 
"example_model"))
+```
+
+</TabItem>
+</Tabs>
+
+### Delete a model
+
+You can delete a model by sending a `DELETE` request to the 
`/api/metalakes/{metalake_name}
+/catalogs/{catalog_name}/schemas/{schema_name}/models/{model_name}` endpoint 
or by using the
+Gravitino Java/Python client. The following is an example of deleting a model:
+
+<Tabs groupId="language" queryString>
+<TabItem value="shell" label="Shell">
+
+```shell
+curl -X DELETE -H "Accept: application/vnd.gravitino.v1+json" \
+-H "Content-Type: application/json" \
+http://localhost:8090/api/metalakes/example/catalogs/model_catalog/schemas/model_schema/models/example_model
+```
+
+</TabItem>
+<TabItem value="java" label="Java">
+
+```java
+// ...
+Catalog catalog = gravitinoClient.loadCatalog("model_catalog");
+catalog.asModelCatalog().deleteModel(NameIdentifier.of("model_schema", 
"example_model"));
+// ...
+```
+
+</TabItem>
+<TabItem value="python" label="Python">
+
+```python
+gravitino_client: GravitinoClient = 
GravitinoClient(uri="http://localhost:8090";, metalake_name="example")
+
+catalog: Catalog = gravitino_client.load_catalog(name="model_catalog")
+catalog.as_model_catalog().delete_model(NameIdentifier.of("model_schema", 
"example_model"))
+```
+
+</TabItem>
+</Tabs>
+
+Note that the delete operation will delete all the model versions under this 
model.
+
+### List models
+
+You can list all the models in a schema by sending a `GET` request to the 
`/api/metalakes/
+{metalake_name}/catalogs/{catalog_name}/schemas/{schema_name}/models` endpoint 
or by using the
+Gravitino Java/Python client. The following is an example of listing all the 
models in a schema:
+
+<Tabs groupId="language" queryString>
+<TabItem value="shell" label="Shell">
+
+```shell
+curl -X GET -H "Accept: application/vnd.gravitino.v1+json" \
+-H "Content-Type: application/json" \
+http://localhost:8090/api/metalakes/example/catalogs/model_catalog/schemas/model_schema/models
+```
+
+</TabItem>
+<TabItem value="java" label="Java">
+
+```java
+// ...
+Catalog catalog = gravitinoClient.loadCatalog("model_catalog");
+NameIdentifier[] identifiers = 
catalog.asModelCatalog().listModels(Namespace.of("model_schema"));
+// ...
+```
+
+</TabItem>
+<TabItem value="python" label="Python">
+
+```python
+gravitino_client: GravitinoClient = 
GravitinoClient(uri="http://localhost:8090";, metalake_name="example")
+
+catalog: Catalog = gravitino_client.load_catalog(name="model_catalog")
+model_list = 
catalog.as_model_catalog().list_models(namespace=Namespace.of("model_schema")))
+```
+
+</TabItem>
+</Tabs>
+
+## ModelVersion operations

Review Comment:
   Where is the definition of term `ModelVersion`?



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