A mechanism for describing a writer's components. It is used to express relationships between components, in particularly their hierarchy. For instance, if a writer managed several electronic books, it might assign logical paths of "\ebook\book1" and "\ebook\book2" to file group components containing each book. Logical paths are required when specifying subcomponents.
By convention the backslash "\" is used to separate elements of a logical path. Beyond that, there are no restrictions on the characters that can appear in a non-NULL logical path.
A logical path can be NULL. By convention, components with NULL logical paths are said to be at the top level of a writer's logical path hierarchy.