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 . 19. The encoding method of claim 18 , wherein an initial compression dictionary to compress the structure channel is updated based on the structure channel of another block of structured data previously arranged into structure and value channels.