declare missing property
add AbstractRequest for public property

see
https://scrutinizer-ci.com/g/koriym/BEAR.Resource/inspections/e4717576-9
56a-4650-b97c-18851a231f40/issues/files/src/Anchor.php?status=existing&o
rderField=path&order=asc
fix docbloc
declare missing property
declare variable for scrutinizer