You can use the operation Document.Fetch when you want to fetch a given document by its ID, or by its path. Actually you won't probably have to use it frequently: most of the time you'll be working on the current document, or one of its children, or its parent, or on the result of a query.
Anyway, if you want to access a document by its path or its ID, just drop this Fetch > Document operation in the operation chain editor, and either put:
A path, like
/default-domain/workspaces/my-workspaceYou will find the path of a document in its URL: It is the part of URL that starts with
/default-domain/...(if you are in the default domain) and that finishes with the name of the document (most often its title without accents, space, ... and sometimes with some additional numbers).A computed path using a scripted instruction like
expr:/default-domain/sections+@{Document.path.substring("/default-domain/workspaces".length -1)}This expression will give the path of a published document in the sections considering it has been published in the same place as in the workspaces.
An ID like
76c69a54-0230-457a-b42c-e819d5ace862You can get the ID of a document by clicking on the permanent link beside the title of a document in Nuxeo Platform.