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This is used by extensions as away to serialize and deserialize properties on asset object JSON. This methodology mutates the complete catalog tree, unless skip_unresolvedis True, in which case solely resolved links are modified. This is usefulin the case when you've loaded a large catalog and you’ve added a fewitems/children, and you only wish to replace those newly-added objects,not the whole tree. A base class for different PySTAC classes that incorporates quite lots of usefulmethods for dealing with links, copying objects, accessing extensions, and rea