Procedures cannot be created in MariadB 10.1.26

[karstengit]

The sense of this procedures is not clear?

Why there is no hint in the installation description that additional tables and/or procedures must be installed?

create procedure create_parent_pages() modifies sql data
begin
create table parent_pages (
parent_page_id int unsigned not null,
page_id int unsigned not null,
primary key (page_id),
foreign key (page_id) references page (page_id) on delete cascade on update cascade,
foreign key (parent_page_id) references page (page_id) on delete cascade on update cascade
)

MySQL meldet: Dokumentation
#1064 - Fehler in der SQL-Syntax. Bitte die korrekte Syntax im Handbuch nachschlagen bei '' in Zeile 9