A data source is an external repository that stores information about Application Programming Interfaces (APIs).
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The repository can be, for example:
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a Web database service,
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an API metadata file (.metaxml) obtained from a Software Development Kit (SDK).
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API information identifies, for example, the header files, DLL files, subsystems, SDKs, and the contact persons for an API. However, different data sources contain different levels of detail. To check which data source suits your needs the best and how to take it into use, see the topics under Data source configurations.