Data Metadata

Most entities (data, services, workflow, publications) within CARMEN have metadata attached that provide additional information on that object. For data, the CARMEN system allows an extensive metadata document to be applied to one or more files when they are uploaded. The current metadata document is based around Electrophysiology data, though we plan to add other variations, especially EEG data. The electrophysiology metadata document is based around the CARMEN MINI Electrophysiology document.

We encourage users to add as much metadata as possible. This gives added value to the data, both for the user and for other users sharing the data. Metadata also enables data to be found more easily using our search facility.  The CARMEN metadata system allows metadata document instances, called templates, to be stored and re-used at a later date. This saves time when doing repeat uploads on similar data. There is more information on templates below.

minimal metadataA single metadata document is attached to all files within a data upload process. This means that only related files, for say an exeperiment, should be uploaded at a time.

Once the data upload process has completed, the metadata can still be modified by selecting the data of interest, and clicking on the “Edit Metadata” button in the RHS panel.

The "Edit Metadata" button
The “Edit Metadata” button

The metadata document can then be modified. Upon completion, you are asked which files (associated with the original metadata) to apply the new modified metadata document to.

Templates

The electrophysiology metadata document is quite extensive, and can be time-consuming to complete, especially for data that is similar to previous uploads.

New templates can be created at any point in the process. In the simplest case, a user may use a standard template for each new experiment and simply change one or two values. At its most flexible the system allows the user to create templates for each kind of experiment, item of equipment, study subject, process, etc., and then to pull one or more templates together to describe a new experiment.