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Grewe, Jan; Wachtler, Thomas ORCID logoORCID: https://orcid.org/0000-0003-2015-6590 and Benda, Jan (2011): A bottom-up approach to data annotation in neurophysiology. In: Frontiers in Neuroinformatics, Vol. 5, 16: pp. 1-18

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Metadata providing information about the stimulus, data acquisition, and experimental conditionsare indispensable for the analysis and management of experimental data within a lab. However, only rarely are metadata available in a structured, comprehensive, and machine-readable form.This poses a severe problem for finding and retrieving data, both in the laboratory and on thevarious emerging public data bases. Here, we propose a simple format, the “open metaData Markup Language” (odML), for collecting and exchanging metadata in an automated, computerbased fashion. In odML arbitrary metadata information is stored as extended key–value pairs in a hierarchical structure. Central to odML is a clear separation of format and content, i.e.,neither keys nor values are defined by the format. This makes odML flexible enough for storingall available metadata instantly without the necessity to submit new keys to an ontology orcontrolled terminology. Common standard keys can be defined in odML-terminologies forguaranteeing interoperability. We started to define such terminologies for neurophysiologicaldata, but aim at a community driven extension and refinement of the proposed definitions. Bycustomized terminologies that map to these standard terminologies, metadata can be named andorganized as required or preferred without softening the standard. Together with the respective libraries provided for common programming languages, the odML format can be integrated into the laboratory workflow, facilitating automated collection of metadata information where it becomes available. The flexibility of odML also encourages a community driven collection and definition of terms used for annotating data in the neurosciences.

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