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Christoph M. Becker
d61bc63c4d
While we generally prefer objects over resources for quite a while, the procedural XMLWriter API still uses resources, although there is already an object-oriented API which uses objects. This dichotomy makes no sense, slightly complicates the implementation, and doesn't allow a stepwise migration to the object-oriented API, which might be desired. Thus we completely drop the XMLWriter resources in favor of XMLWriter objects. We consider the minor BC break acceptable for a major version, since only explicit type checks (`is_resource()`, `gettype()` etc.) need to be adapted.