XML retrieve from Postgres

CREATE TABLE test (
    id int PRIMARY KEY,
    xmltext xml
);

INSERT INTO test VALUES (1, '<doc num="C1">
<line num="L1"><a>1</a><b>2</b><c>3</c></line>
</doc>');

INSERT INTO test VALUES (2, '<doc num="C2">
<line num="L2"><a>111</a><b>222</b><c>333</c></line>
</doc>');