Method for accessing a database stored on a server using a relation

A method for creating a relation of data items such that the data items are forming a partially ordered set in the relation, the method comprising:

• receiving a data item having a referential connection to a second data item in a database,
• modifying the received data item using a predefined modification method, the modification method modifying an unmodified value of the received data item resulting in a unique modified data item having a modified value, wherein the modification method is performed such that the modified data item will have the same position in the sorting order in the partially ordered set with respect to all other data items in the partially ordered set that have an unmodified data value different from the unmodified data value of the received data item;
• and inserting the modified data item into the relation.

A method for accessing a relation comprising unique first data items that were subject to a modification from a same given value using a same modification method, the method comprising:

• receiving a request for a data item having the given value;
• processing each data item of the relation and undoing the modification of the data item if the data item is a modified data item, resulting in an unmodified first data item, and providing all the unmodified first data items having the given value.