[GitHub] [incubator-eventmesh] ruanwenjun commented on a change in pull request #502: [ISSUE #339] add design doc for integrating OpenSchema

[GitBox <gi...@apache.org>]

ruanwenjun commented on a change in pull request #502:
URL: https://github.com/apache/incubator-eventmesh/pull/502#discussion_r691838622



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File path: docs/en/features/eventmesh-schemaregistry-design.md
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+# EventMesh SchemaRegistry (OpenSchema)
+
+## Introduction
+
+[EventMesh(incubating)](https://github.com/apache/incubator-eventmesh) is a dynamic cloud-native eventing infrastructure.
+
+## An Overview of Schema and Schema Registry
+
+### Schema
+
+A Schema stands for the description of serialization instances(string/stream/file/...) and has two properties. First, it is also in the format of serialization type. Second, it defines what requirements such serialized instances should satisfy. 
+
+Besides describing a serialization instance, a Schema may also be used for validating whether an instance is legitimate. The reason is that it defines the ```type```(and other properties) of a JSON instance and inside keys. Taking JSON Schema for example, it could not only be referred when dealing with a JSON string, but also be used for  validating whether a string satisfies properties defined in the schema[[1]](#References).
+
+Commonly, there are JSON Schema, Protobuf Schema, and Avro Schema, representing description of JSON instances, Protobuf instances, and Avro instances respectively.
+
+
+### Schema Registry
+
+Schema Registry is a server provides RESTful interfaces. It could receive and store Schemas from clients, as well as provide intrefaces for other clients to retrieve Schemas from it. 
+
+It could be applied to validation process and (de-)serialization process.
+
+### A Comparison of Schema Registry in Other Projects
+
+Project | Application
+:---: | :---
+EMQ[[2]](#References) | Mainly in (de-)serialization process. Use "Schema Registry" and "Rule Matching" to transfer a message from one serialization format to another.
+Pulsar[[3]](#References) | Mainly in validation process. Use "Schema Registry" to validate a message.
+Confluentinc[[4]](#References) | In both validation and (de-)serialization process.
+
+## An Overview of OpenSchema
+
+OpenSchema[[5]](#References) proposes a specification for data schema when exchanging the message and event in more and more modern cloud-native applcations. It designs a RESTful interface for storing and retrieving such as Avro, JSON Schema, and Protobuf3 schemas from three aspects.

Review comment:
       There is a typo error `applcations`




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