CREATE TABLE docs1(
attr1 integer,
attr2 text,
PRIMARY KEY(attr1)
);
CREATE TABLE docs2(
attr1 text,
attr3 text,
PRIMARY KEY(attr1)
);
CREATE TABLE documents(
id integer,
PRIMARY KEY(id)
);
CREATE TABLE documents_docs1(
id integer,
attr1 integer,
FOREIGN KEY(id) REFERENCE TO documents(id),
FOREIGN KEY(attr1) REFERENCE TO docs1(attr1),
PRIMARY KEY(id,attr1)
);
CREATE TABLE documents_docs2(
id integer,
attr1 text,
FOREIGN KEY(id) REFERENCE TO documents(id),
FOREIGN KEY(attr1) REFERENCE TO docs2(attr1),
PRIMARY KEY(id,attr1)
);

CREATE TABLE wiki(
    name text,
    version integer,
    time integer,
    author text,
    ipnr text,
    text text,
    comment text,
    readonly integer,
    PRIMARY KEY(name,version)
);