Merge "Track libxml2 API changes."

        xmlSetGenericErrorFunc(this, errorCb);

    }

    ~Libxml2Global() {

        // TODO: check if all those cleanup are needed

        xmlSetGenericErrorFunc(nullptr, nullptr);

        xmlSchemaCleanupTypes();

        xmlCleanupParser();

        xmlCleanupThreads();

    }

    const std::string& getErrors() { return errors; }