Figure 3:

The metadata input form is generated based on the terminology file created during the initial system setup. (A) Metadata fields are distributed between several tabs where related input fields are grouped together. (B) By loading a previously created metadata file, all form fields will be initialized to the predefined values. Mandatory fields are marked with a red asterisk. (C) Controlled vocabulary can be entered as free-form text, although the system offers to autocomplete entries based on a list of terms retrieved from the web. (D) Help for each input field can be obtained by clicking on a “?” icon, providing users with a definition of the corresponding field. (E) Once completed, the form can be saved as a file (an example has been provided as Additional File 1).