Canonical Fields

To read more about uploading documents on Everlaw, feel free to refer to the articles in our Uploads section.

What are Canonical Fields?

Upon upload, Everlaw automatically detects metadata fields that refer to the same underlying concept, and groups them together. For example, all variations of the custodian field (“Custodian”, “Custdn”, “CUST”, etc.) will be grouped into the “Custodian” field. Though this automatic grouping is performed for all fields in the database, particular attention is paid to approximately 40 of the most common metadata fields, determined through an empirical analysis of the types of metadata fields that appear in document sets. These 40 or so fields are referred to as canonical fields. The canonical fields are listed below:

All Custodians Date Modified Languages
All Paths Date Received MD5 Hash
Application Date Saved Message ID
Attachment IDs Date Sent Original Filename
Attachment Names Document Type Original Path
Author Encrypted Other Custodians
Bcc End Date Produced From
Begin Family End Family SHA1 Hash
Cc Extension Split From
Chat Contributors Family Subject
Confidentiality File Path Start Date
Custodian Filename Title
Dataset From To
Date Has OCR Translation Of
Date Accessed Hash Value  
Date Created In Reply To  

Grouped/Canonical Fields and Searching

For grouped canonical and noncanonical fields, only the group field or canonical name will be searchable. Similar to a metadata alias, searching a grouped or canonical field will search across all the fields grouped under that particular field name. This makes it much easier to search across documents with synonymous fields.


Seeing original fields in the review window

While looking at the metadata panel in the review window, you can see the original field name by hovering above the value for any displayed metadata field. For example, in the image below, the canonical “Date Created” field has replaced the original field name, “Created”.


Have more questions? Submit a request


Article is closed for comments.