22. A data processing system for formulating a context representation, the system comprising: a data processor for processing data; a data storage device for storing instructions; and a data transmission path coupled to the data processor and the data storage device, wherein the instructions, when executed by the data processor, controls the data processing system to perform the machine-implemented steps of: selecting at least one keyword from a plurality of text items; determining a task associated with the plurality of text items; selecting at least one query transformation rule from a plurality of different query transformation rules based on the plurality of text items and the task; generating the context representation by applying the at least one query transformation rule to the at least one keyword, the query transformation rule causing the at least one keyword to be replaced by another keyword; generating a search query based on the context representation; and storing search results associated with the search query in a memory.
22. A data processing system for formulating a context representation, the system comprising: a data processor for processing data; a data storage device for storing instructions; and a data transmission path coupled to the data processor and the data storage device, wherein the instructions, when executed by the data processor, controls the data processing system to perform the machine-implemented steps of: selecting at least one keyword from a plurality of text items; determining a task associated with the plurality of text items; selecting at least one query transformation rule from a plurality of different query transformation rules based on the plurality of text items and the task; generating the context representation by applying the at least one query transformation rule to the at least one keyword, the query transformation rule causing the at least one keyword to be replaced by another keyword; generating a search query based on the context representation; and storing search results associated with the search query in a memory. 29. The system of claim 22 , wherein the task is shopping.