16. A system of claim 1 , wherein the decompression mechanism to decompress third textual data to yield the uncompressed second textual data using the dictionary comprises: receiving the dictionary, the dictionary having a plurality of keys, each key associated with an identifier, the textual data listing one or more of the identifiers, the keys comprising: a plurality of static word or phrase keys, each static word or phrase key listing one or more unchanging words in a particular order; and, a plurality of dynamic phrase keys, each dynamic phrase key listing a plurality of words and one or more placeholders in a particular order, each placeholder denoting a place where a word or phrase other than the words of the dynamic phrase key is to be inserted; each identifier listed within the textual data being replaced with the key associated with the identifier within the dictionary, in an iterative manner, until there are no identifiers listed within the textual data; and, the textual data within which the identifiers have been replaced with keys associated with the identifiers within the dictionary being output.
16. A system of claim 1 , wherein the decompression mechanism to decompress third textual data to yield the uncompressed second textual data using the dictionary comprises: receiving the dictionary, the dictionary having a plurality of keys, each key associated with an identifier, the textual data listing one or more of the identifiers, the keys comprising: a plurality of static word or phrase keys, each static word or phrase key listing one or more unchanging words in a particular order; and, a plurality of dynamic phrase keys, each dynamic phrase key listing a plurality of words and one or more placeholders in a particular order, each placeholder denoting a place where a word or phrase other than the words of the dynamic phrase key is to be inserted; each identifier listed within the textual data being replaced with the key associated with the identifier within the dictionary, in an iterative manner, until there are no identifiers listed within the textual data; and, the textual data within which the identifiers have been replaced with keys associated with the identifiers within the dictionary being output. 19. The system of claim 16 , wherein at least one of the dynamic phrase keys identifies one or more of the words of the dynamic phrase key by identifiers for corresponding static words or phrase keys.