Textual format Experiment annotation format ISA-Tab ISA-Tab format can be converted to ISA-JSON (edam:format_4069; validated against a set of JSON Schemata defined by the ISA model). From ISA-JSON, a serialisation to RDF (JSON-LD) is possible when using a series of JSON context files. 1.13 Investigation Study Assay Tabular The ISA model consists of three core entities to capture experimental metadata: Investigation, Study, and Assay. The ISA-Tab is a composite format comprised of one i_Investigation.txt file (edam:format_4066), and one or more Study (s_*.txt; edam:format_4067) and Assay (a_*.txt; edam:format_4068) files. Based on the Investigation / Study / Assay (ISA) Abstract Model, the tab-delimited ISA-Tab format supports the metadata related to multimodality/multi-omics studies which employ a combination of data acquisition techniques. ISA-Tab extends the MAGE-TAB format (edam:format_3162) and its gene expression-specific focus, but remains compatible with it. Ontologies should be used. Any ontology is accepted, as long as it is correctly recorded. ISA-Tab stands for Investigation / Study / Assay (ISA) tab-delimited (Tab) format, and it is comprised of metadata describing observational or experimental scientific studies. ISA-JSON