XQuery not only could be used for query operations, rather than we could use it for inserting, deleting or renaming nodes The "insert" statement is used to insert a node into an other one with the following syntax:

insert NODE into [ as [ first | last ] ] TARGET_NODE
insert NODE [ after | before ] TARGET_NODE

Inserting a person as a last one:

insert <person id="P3"><information/></person> as last into /persons

The „replace” statement is used to replace one node to a entirely new one with the following syntax:

replace node CSOMÓPONT with NEW_NODE              :replacing the whole node
replace value of node CSOMÓPONT with NEW_VALUE    :replacing only the value

Replacing a person with P1 id to a person with id P2:

replace node /persons/person[@id="P1"] with <person id="P2"></person>

Changing patient P1's name:

replace value of node /persons/person[@id="P1"]/information/personalInformation/name with "Ödön"

The "delete" statement is used to remove nodes:

delete NODE

Deleting all the persons where the SSN is empty:

delete /persons/person[not(information/medicalInformation/SSN)]