18. A method of encoding a block of structured data of a structured document, comprising obtaining a structure channel grouping structural information of the structured data and at least one value channel grouping content information that corresponds to the same structural information; and compressing at least one of the structure and value channels using the method of claim 1 .
18. A method of encoding a block of structured data of a structured document, comprising obtaining a structure channel grouping structural information of the structured data and at least one value channel grouping content information that corresponds to the same structural information; and compressing at least one of the structure and value channels using the method of claim 1 . 20. The encoding method of claim 18 , wherein an initial compression dictionary to compress the value channel is updated based on a corresponding value channel of another block of structured data previously arranged into structure and value channels, said corresponding value channel of the other block of structured data corresponding to the same structural information as the value channel to compress.