Image-level Identification

The elements discussed above apply to a document at a document "envelope" level, and serve to identify, group, and sort documents, and store additional useful information about a document, including free-form notes.

Because there can be multiple "images" associated with a document, each separate image file is assigned a unique identifier-key known as a Sub-ID.  Note that the term "image" is used loosely here, and simply refers to a different version of the document.  There can be a text image, a PDF image, and/or a tiff image of the same document.

When text-based documents are stored in the archive by an UnForm ruleset command, UnForm will default the Sub-ID value to @text for the text version of a document, and @unform for the pdf version of a document.

Documents stored in the archive via UnForm's command-line syntax will not have a default sub-ID assigned, so the user or the application must create a Sub-ID using the –arcsubid command line option.

In addition to the document file and the sub ID, UnForm also stores the date and time a particular image was last updated, plus a description field called a sub-title.