feat(model): Introduce Hello demo model

docs/models/demo/hello/README.md

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+<!--
+    SPDX-License-Identifier: Apache-2.0
+
+    Copyright 2023-2024 The Enola <https://enola.dev> Authors
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        https://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+
+# Hello
+
+Please first [install Enola](../../../use/), if you haven't already.
+
+Then let's do a [`hello, world`](https://en.wikipedia.org/wiki/%22Hello,_World!%22_program)!
+
+## Type
+
+Greetings are a kind of _Type._ Let's define one, in [`hello.type.yaml`](hello.type.yaml):
+
+<!-- TODO Include the YAML, without the LICENSE header -->
+
+```yaml
+...
+```
+
+Now let's use this:
+
+```bash
+./enola --model hello.type.yaml get hello/world
+world
+```
+
+<!-- TODO Make ExecMD a testing tool, and FAIL if output is not as inlined & excepted -->
+
+## Schema
+
+Our first `enola.dev/demo/hello` _"type"_ was just a `string`. That was a great start - but now let's define our first _data structure._ We'll use [Protocol Buffers](https://protobuf.dev) (for now, [later others](../../../concepts/core.md#schemas)) to define a _"schema",_ in [`greeting.proto`](greeting.proto):
+
+<!-- TODO Include the Proto, without the LICENSE header -->
+
+```proto
+...
+```
+
+and use this by changing that `schema: string:` from above to `proto: dev.enola.demo.hello.Greeting` as in [`greeting.type.yaml`](greeting.type.yaml), and then:
+
+```bash
+./enola --model greeting.type.yaml get hello/world
+message: world
+```
+
+The output is no longer just text, but now structured information - the `message` is `world`. This is YAML format. Enola also supports [other _formats_](../../../concepts/core.md#formats), e.g. as JSON:
+
+```bash
+./enola --model greeting.type.yaml get --format=json hello/world
+{ message: world }
+```
+
+## Template
+
+TODO Initially not for link but just set `message` to "hello, {{{ greeting }}}" prefix (change `uri: hello/{greeting}`)
+
+## Link
+
+TODO [`linked.proto`](linked.proto), with an `enola:` URI template, and here introduce the Web UI!!!
+
+https://docs.enola.dev/use/connector/#uri-templates
+
+## Connector
+
+https://docs.enola.dev/use/connector/#file-system-repository
+
+## Reflection
+
+```bash
+./enola --model greeting.type.yaml get enola/type/greeting
+name: enola.dev/demo/hello
+uri: hello/{message}
+schema:
+  proto: dev.enola.demo.hello.Greeting
+```
+
+Open in the Web interface, and note link to `Greeting`.

docs/models/demo/hello/greeting.proto

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+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright 2023-2024 The Enola <https://enola.dev> Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package dev.enola.demo.hello;
+
+message Greeting {
+  string message = 1;
+}

docs/models/demo/hello/greeting.type.yaml

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+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright 2023-2024 The Enola <https://enola.dev> Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# TODO Publish schema & Remove yaml-language-server
+# yaml-language-server: $schema=../../enola/schemas/Type.schema.json
+
+name: enola.dev/demo/hello
+uri: hello/{message}
+proto: greeting.proto#dev.enola.demo.hello.Greeting

docs/models/demo/hello/hello.type.yaml

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+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright 2023-2024 The Enola <https://enola.dev> Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# TODO Publish schema & Remove yaml-language-server
+# yaml-language-server: $schema=../../enola/schemas/Type.schema.json
+
+name: enola.dev/demo/hello
+uri: hello/{message}
+# TODO Do we *really* need this?
+# string:

docs/models/demo/hello/linked.proto

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+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright 2023-2024 The Enola <https://enola.dev> Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package dev.enola.demo.hello;
+
+import "core/lib/src/main/java/dev/enola/core/enola_ext.proto";
+
+message Greeting {
+  string message = 1;
+  string google = 2
+      [(dev.enola.url) = "https://www.google.com/search?q={{ message }}"];
+  string link = 3 [(dev.enola.type) = "dev.enola.demo.hello"];
+}

docs/models/demo/library/favorites.yaml

@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright 2023-2024 The Enola <https://enola.dev> Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# TODO JSON Schema, generated from library.proto!
+
+isbn: 0434961604
+title: The Little Prince
+rating: RATING_TOP_TIP
+
+---
+isbn: 0-13-140731-7
+rating: RATING_LIKE_IT
+# title will be fetched by Connector!

docs/models/demo/library/library.proto

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+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright 2023-2024 The Enola <https://enola.dev> Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package dev.enola.demo.library;
+
+import "core/lib/src/main/java/dev/enola/core/enola_ext.proto";
+
+message Book {
+  string isbn = 1;
+  // TODO Write a Connector using some REST API which fetches a Book's Title,
+  // given its ISBN.
+  string title = 2;
+  int32 pages = 3;
+}
+
+message Favorite {
+  string isbn = 1 [(dev.enola.type) = "enola.dev/demo/library/book"];
+
+  Rating rating = 2;
+
+  enum Rating {
+    RATING_UNSPECIFIED = 0;
+    RATING_OH_WELL = 1;
+    RATING_WHY_NOT = 2;
+    RATING_ITS_OKY = 3;
+    RATING_LIKE_IT = 4;
+    RATING_TOP_TIP = 5;
+  }
+}
+
+message Favorites {
+  repeated Favorite favorites = 1;
+}

docs/models/demo/library/library.types.yaml

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+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright 2023-2024 The Enola <https://enola.dev> Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# yaml-language-server: $schema=../../enola/schemas/Types.schema.json
+
+# TODO Demo how to alternative declare this in library.proto, with extensions.
+
+types:
+  - name: enola.dev/demo/library/book
+    proto: library.proto#dev.enola.demo.library.Book
+    emoji: 📖
+    properties:
+      openlibrary:
+        link: https://openlibrary.org/search?isbn={path.isbn}
+        labels:
+          en: Open Library
+      google:
+        link: https://www.google.com/search?tbm=bks&q=isbn:{path.isbn}
+        labels:
+          en: Google Book Search
+          fr: Recherche de Livres sur Google
+      urn:
+        # https://en.m.wikipedia.org/wiki/Uniform_Resource_Name
+        link: urn:isbn:{isbn}
+
+  - name: enola.dev/demo/library/favorites
+    proto: dev.enola.demo.library.Favorites
+    emoji: ⭐

mkdocs.yaml

@@ -26,8 +26,11 @@ copyright: Copyright &copy; 2023 The Enola <https://enola.dev> Authors
 nav:
   - News (Blog): blog/index.md
   - Introduction: index.md
+  - Installation: use/index.md
+  - Models:
+      - Demo:
+          - Hello: models/demo/hello/README.md
   - Users:
-      - Overview: use/index.md
       - Help: use/help/index.md
       - Example Model: use/library/index.md
       - DocGen: use/docgen/index.md