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XPCOM itself provides a set of core components and classes, e.g. file and memory management, threads, basic data structures (strings, arrays, variants), etc. The majority of XPCOM components are not part of this core set and are provided by other parts of the platform (e.g. Gecko or Necko) or by an application or even by an extension.
- Language bindings
- An XPCOM Language Binding is a bridge between a particular language and XPCOM to provide access to XPCOM objects from that language, and to let modules written in that language be used as XPCOM objects by all other languages for which there are XPCOM bindings.
- XPCOM glue
- The XPCOM Glue is a static library which component developers and embedders can link against. It allows developers to link only against the frozen XPCOM method symbols and maintain compatibility with multiple versions of XPCOM.
- XPCOM guide
- These articles provide tutorials and usage documentation for XPCOM, including how to use it in your own projects and how to build XPCOM components for your Firefox add-ons and the like.
- XPCOM reference
- This reference describes the interfaces and functions provided by the XPCOM library. In addition, it details the various helper classes and functions, as well as the components, provided by the XPCOM glue library. The contents herein are oriented primarily toward extension developers and people embedding XPCOM in other projects.