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The API describes and prescribes the "expected behavior" (a specification) while the library is an "actual implementation" of this set of rules. A single API can have multiple implementations (or none, being abstract) in the form of different libraries that share the same programming interface.
A high-level comparison of in-kernel and kernel-to-userspace APIs and ABIs The Linux kernel and GNU C Library define the Linux API. After compilation, the binaries offer an ABI. Keeping this ABI stable over a long time is important for ISVs. In computer software, an application binary interface (ABI) is an interface between two binary program ...
API writers typically possess a mix of programming and language skills; many API writers have backgrounds in programming or technical writing. Computer programming background (Knowledge of C, C++, Java, PHP, or other programming languages) Knowledge of formatting standards like Doxygen, Javadoc, OpenAPI, or DITA; Knowledge of editors and tools ...
In most cases, an FFI is defined by a higher-level language, so that it may employ services defined and implemented in a lower-level language, typically a system programming language like C or C++. This is typically done to either access operating system (OS) services in the language in which the OS API is defined, or for performance goals.
Although this API can be called by an end user with a web browser (as in this example) it is intended to be called automatically by software or by computer programmers while writing software. JSON is intended to be parsed by a computer program, which would extract the URL of the photograph and the other metadata. The resulting photo could be ...
API description languages are sometimes called interface description languages (IDLs). The structured description might be used to generate documentation for human programmers; such documentation may be easier to read than free-form documentation, since all documentation generated by the same tool follows the same formatting conventions ...
An abstract syntax tree (AST) is a data structure used in computer science to represent the structure of a program or code snippet. It is a tree representation of the abstract syntactic structure of text (often source code) written in a formal language.
An open API (often referred to as a public API) is a publicly available application programming interface that provides developers with programmatic access to a (possibly proprietary) software application or web service. [1] Open APIs are APIs that are published on the internet and are free to access by consumers. [2]