Found the following significant warnings:
  Warning: S3 methods ‘[.xml_missing’, ‘[.xml_nodeset’, ‘[[.xml_missing’, ‘xml_attr<-.xml_missing’, ‘xml_attr<-.xml_node’, ‘xml_attr<-.xml_nodeset’, ‘xml_attrs<-.xml_missing’, ‘xml_attrs<-.xml_node’, ‘xml_attrs<-.xml_nodeset’, ‘xml_name<-.xml_missing’, ‘xml_name<-.xml_node’, ‘xml_name<-.xml_nodeset’, ‘xml_text<-.xml_missing’, ‘xml_text<-.xml_node’, ‘xml_text<-.xml_nodeset’, ‘as.character.xml_document’, ‘as.character.xml_missing’, ‘as.character.xml_node’, ‘as.character.xml_nodeset’, ‘as_list.xml_document’, ‘as_list.xml_missing’, ‘as_list.xml_node’, ‘as_list.xml_nodeset’, ‘as_xml_document.character’, ‘as_xml_document.connection’, ‘as_xml_document.list’, ‘as_xml_document.raw’, ‘as_xml_document.response’, ‘as_xml_document.xml_document’, ‘as_xml_document.xml_node’, ‘as_xml_document.xml_nodeset’, ‘format.xml_node’, ‘is.na.xml_missing’, ‘is.na.xml_node’, ‘is.na.xml_nodeset’, ‘nodeset_apply.xml_document’, ‘nodeset_apply.xml_missing’, ‘nodeset_apply.xml_node’, ‘nodeset_apply.xml_nodeset’, ‘print.xml_document’, ‘print.xml_missing’, ‘print.xml_namespace’, ‘print.xml_node’, ‘print.xml_nodeset’, ‘read_html.default’, ‘read_html.response’, ‘read_xml.character’, ‘read_xml.connection’, ‘read_xml.raw’, ‘read_xml.response’, ‘tree_structure.xml_missing’, ‘tree_structure.xml_node’, ‘tree_structure.xml_nodeset’, ‘write_html.xml_document’, ‘write_html.xml_missing’, ‘write_html.xml_node’, ‘write_html.xml_nodeset’, ‘write_xml.xml_document’, ‘write_xml.xml_missing’, ‘write_xml.xml_node’, ‘write_xml.xml_nodeset’, ‘xml_add_child.xml_document’, ‘xml_add_child.xml_missing’, ‘xml_add_child.xml_node’, ‘xml_add_child.xml_nodeset’, ‘xml_add_parent.xml_missing’, ‘xml_add_parent.xml_node’, ‘xml_add_parent.xml_nodeset’, ‘xml_add_sibling.xml_missing’, ‘xml_add_sibling.xml_node’, ‘xml_add_sibling.xml_nodeset’, ‘xml_attr.xml_missing’, ‘xml_attr.xml_node’, ‘xml_attr.xml_nodeset’, ‘xml_attrs.xml_missing’, ‘xml_attrs.xml_node’, ‘xml_attrs.xml_nodeset’, ‘xml_double.xml_missing’, ‘xml_double.xml_node’, ‘xml_double.xml_nodeset’, ‘xml_find_all.xml_missing’, ‘xml_find_all.xml_node’, ‘xml_find_all.xml_nodeset’, ‘xml_find_chr.xml_missing’, ‘xml_find_chr.xml_node’, ‘xml_find_chr.xml_nodeset’, ‘xml_find_first.xml_node’, ‘xml_find_first.xml_nodeset’, ‘xml_find_lgl.xml_missing’, ‘xml_find_lgl.xml_node’, ‘xml_find_lgl.xml_nodeset’, ‘xml_find_num.xml_missing’, ‘xml_find_num.xml_node’, ‘xml_find_num.xml_nodeset’, ‘xml_integer.xml_missing’, ‘xml_integer.xml_node’, ‘xml_integer.xml_nodeset’, ‘xml_length.xml_missing’, ‘xml_length.xml_node’, ‘xml_length.xml_nodeset’, ‘xml_name.xml_missing’, ‘xml_name.xml_node’, ‘xml_name.xml_nodeset’, ‘xml_ns.xml_document’, ‘xml_ns.xml_missing’, ‘xml_ns.xml_node’, ‘xml_ns.xml_nodeset’, ‘xml_parent.xml_missing’, ‘xml_parent.xml_node’, ‘xml_parent.xml_nodeset’, ‘xml_path.xml_missing’, ‘xml_path.xml_node’, ‘xml_path.xml_nodeset’, ‘xml_remove.xml_missing’, ‘xml_remove.xml_node’, ‘xml_remove.xml_nodeset’, ‘xml_replace.xml_missing’, ‘xml_replace.xml_node’, ‘xml_replace.xml_nodeset’, ‘xml_serialize.xml_document’, ‘xml_serialize.xml_node’, ‘xml_serialize.xml_nodeset’, ‘xml_set_attr.xml_missing’, ‘xml_set_attr.xml_node’, ‘xml_set_attr.xml_nodeset’, ‘xml_set_attrs.xml_missing’, ‘xml_set_attrs.xml_node’, ‘xml_set_attrs.xml_nodeset’, ‘xml_set_name.xml_missing’, ‘xml_set_name.xml_node’, ‘xml_set_name.xml_nodeset’, ‘xml_text.xml_missing’, ‘xml_text.xml_node’, ‘xml_text.xml_nodeset’, ‘xml_type.xml_missing’, ‘xml_type.xml_node’, ‘xml_type.xml_nodeset’, ‘xml_url.xml_missing’, ‘xml_url.xml_node’, ‘xml_url.xml_nodeset’, ‘xml_validate.xml_document’ were declared in NAMESPACE but not found
See ‘/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/selectr.Rcheck/00install.out’ for details.