GraphQL Zeus vs OpenAPI Specification: What are the differences?

# Introduction
This Markdown code discusses key differences between GraphQL Zeus and OpenAPI Specification.

1. **Data Modeling**: GraphQL Zeus is strongly typed and relies on a schema language to define data types and structures, providing more control and specificity in modeling data. On the other hand, OpenAPI Specification offers a more flexible approach to data modeling, allowing for a variety of data structures without strict typing constraints.
2. **Querying Approach**: GraphQL Zeus uses a query language that enables clients to request specific data they need, reducing over-fetching issues commonly seen in REST APIs. In contrast, OpenAPI Specification relies on predefined endpoints that clients can access to retrieve data, which may result in fetching unnecessary data at times.
3. **Real-time Communication**: GraphQL Zeus supports real-time communication through subscriptions, allowing clients to receive live updates when data changes. OpenAPI Specification lacks built-in support for real-time communication, requiring additional technologies or protocols to achieve similar functionality.
4. **Versioning and Evolution**: GraphQL Zeus provides a more seamless experience when it comes to versioning and evolving APIs, with capabilities like deprecating fields and types while maintaining backward compatibility. OpenAPI Specification may require more manual handling of versioning, potentially leading to inconsistencies and API compatibility issues over time.
5. **Error Handling**: GraphQL Zeus offers a more standardized approach to error handling through predefined error types and structures, making it easier for clients to understand and handle errors. OpenAPI Specification provides flexibility in error responses, but without strict guidelines, it can lead to inconsistent error formats across different APIs.
6. **Tooling Ecosystem**: GraphQL Zeus has a rich tooling ecosystem that includes tools for schema validation, code generation, and debugging, enhancing developer productivity. OpenAPI Specification also has a variety of tools available, but they may not be as specialized for API development compared to the GraphQL ecosystem.

In Summary, GraphQL Zeus and OpenAPI Specification differ in data modeling, querying approach, real-time communication support, versioning and evolution capabilities, error handling standards, and tooling ecosystems.