This box searches only documentation in the Data Store space. To search the entire CyVerse wiki, use the box at the upper right.


For overview information, see Data Store or Manage Data on the CyVerse website.

DATA STORE USER MANUAL

Versions Compared

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.
Section
Column
width65%

Metadata is data about data. You can add metadata in a terminal window using the imeta commands after giving QuickShare read/write permissions. iRODS metadata (imeta) includes user-defined and iRODS system attributes stored in the iCAT database related to a data object, collection, resource, or user, etc. For information on using iCommands, see Sharing Data from the Command Line (iCommands).

Info

You also can add metadata within the Discovery Environment.

About the metadata databases

Prior to the 2.7 release of the Discovery Environment, all metadata both from within the Discovery Environment (DE) and via iCommands was written to and accessed from the iRODS metadata database. However, the iRODS metadata database allows only three fields (attribute, value, and unit, or A,V, and U), so it is not ideally suited for the dense data needs of semantic data (e.g., metadata linked to ontology terms).

As a result, CyVerse launched the CyVerse metadata database with the 2.7 DE release. This new database can store an unlimited number of metadata fields, providing a much more scalable framework for the needs of semantic data used in the CyVerse Data Store. Metadata created in the DE after the 2.7 release is stored in the new CyVerse metadata database.

Both databases are indexed, searchable, and accessible through the DE.

Metadata created before the 2.7 release as part of a metadata template (e.g., SRA submission or DOI request) was already stored in and remains in the DE metadata database.

Metadata that was created before the 2.7 release without a template remains safely stored in the iRODS metadata database. That metadata can still be read and searched for within the DE, and both written and read using iCommands imeta, but it cannot be used in templates. Users can transfer their data from the iRODS metadata database to the CyVerse metadata database but because it is no longer possible to create iRODS metadata from within the DE, the , but the operation cannot be undone. User who require command-line access to metadata should continue to use iCommands until command-lines access to the DE metadata database is available.

Both databases are indexed, searchable, and accessible through the DE.

Metadata is defined in this system as a triplet (Using iCommands to edit metadata

iRODS metadata is defined as a Attribute-Value-Unit ) triplet, for example:

Description

Example

Help command

Attribute Name (AttName)

Code Block
titleExample: AttName
name: length

imeta -h

Attribute Value (AttVal)

Code Block
titleExample: AttVal
value: 2.5

imeta -h

Attribute Unit (AttUnits)

Code Block
titleExample: AttUnits
unit: meter

imeta -h

For basics on using iCommands, see Using iCommands. Writing, deleting, editing, and listing metadata are possible with the 'imeta' command.

For more information on using imeta commands, see imeta - iRODS, view the quick tutorial on iRODS metadata on the iRODS website, or enter imeta -h in the terminal window.

Need help?

If you have problems or need assistance, see Get Help on the CyVerse website or email Support (support@cyverse.org).

Column
width35%
Panel
bgColorWhiteSmoke
titleBGColorSteelBlue
titleHelpful Links
borderWidth1px
titleColorWhite

On This Page:

Related Pages: