For Process Formats that contain more than one Document Type, using a Common ID increases the speed of the process. The Common ID is a text string or form feed common to all Document Types in the Process Format. When a Common ID is configured, the parser will look for the Common ID to quickly determine the start of a new page (instead of looking for multiple ID Strings - one ID string per Document Type).
After finding the Common ID to determine the page terminations, it will look at the ID string to determine Document Type and the Keyword Values to determine individual documents.
If a Common ID is not found across a portion of text that contains other page and document identifiers (Document ID String, Keywords), that text is appended as a page to the previous document.
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If you want to be able to identify all pages not containing a Document ID string, elect to make the Common ID an Absolute Common ID.
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A page that contains an Absolute Common ID but is missing a Document ID string will be separated into a new document and stored in the SYS Unidentified Items Document Type.