A latex markup directive. This is used to represent %%Zchar and %%Zword directives used in latex markup (A.2.3). The Command contains the complete latex command, including the leading backslash, whereas Unicode contains the corresponding unicode representation. The attribute is used to distinguish the kind or type of directive, for instance whether it was a %%Zinchar, which corresponds to type "NONE", or %%Zinword in which case the type is "IN".
Note that there is no unique tranlation back to a latex markup directive in latex since there could be several latex strings representing a unicode string. However, if one does want to translate back into latex markup directives, then directives with a single unicode character should be translated into the various %%Z...char commands and all other directives should be translated into %%Z...word commands (after translating each unicode character into a latex command).