1. A method for retrieval of one or more relevant multi-attribute structured objects with respect to a query, wherein the method comprises: receiving a user query for retrieval of one or more multi-attribute structured objects from a database that includes multiple objects with interdependent and independent attributes; receiving user instructions specifying how the interdependent and independent attributes are to be grouped in carrying out the query; grouping the attributes of the objects in the database into one or more groups according to the user instructions by: associating each of the attributes with a list of one or more database objects that are ordered in an increasing value of dissimilarity from a query value for the respective attribute; combining multiple aggregation operators in accordance with user-provided specifications, wherein the multiple aggregation operators comprise: (i) an intersection aggregation operator, wherein the intersection aggregation operator deems a first object as having a lower value of dissimilarity than a second object if the most dissimilar attribute of the first object has a higher absolute value than the most dissimilar attribute of the second object, (ii) a union aggregation operator, wherein the union aggregation operator deems a first object as having a lower value of dissimilarity than a second object if the least dissimilar attribute of the first object has a higher absolute value than the least dissimilar attribute of the second object, (iii) a generalized mean aggregation operator, and (iv) a Euclidean distance aggregation operator, to compose the interdependent attributes into multiple interdependent attribute compositions; and using a skyline operator to combine the multiple interdependent attribute compositions and the independent attributes into the one or more groups according to the user instructions; and using the one or more attribute groups to produce an output of a sorted list of one or more relevant multi-attribute structured objects from the database in response to the query that express preference specification of the one or more attributes.