This YAML file can be used to in the recipe to declare specific information to be used inside the recipe. This file is specific to each recipe conanfile.py and it should be placed next to it. The file is automatically exported with the recipe (no need to add it to exports attribute) and its content is loaded into the conan_data attribute of the recipe.
This file can be used, for example, to declare a list of sources links and checksums for the recipe or a list patches to apply to them, but you can use it to store any data you want to extract from the recipe. For example:
sources: 1.70.0: url: "https://dl.bintray.com/boostorg/release/1.70.0/source/boost_1_70_0.tar.bz2" sha256: "430ae8354789de4fd19ee52f3b1f739e1fba576f0aded0897c3c2bc00fb38778" 1.71.0: url: "https://dl.bintray.com/boostorg/release/1.71.0/source/boost_1_71_0.tar.bz2" sha256: "d73a8da01e8bf8c7eda40b4c84915071a8c8a0df4a6734537ddde4a8580524ee" patches: 1.70.0: patches: "0001-beast-fix-moved-from-executor.patch,bcp_namespace_issues.patch" 1.71.0: patches: "bcp_namespace_issues.patch,boost_build_qcc_fix_debug_build_parameter.patch"