Table 4:

Software metadata initiatives

Initiative	Description
HCLS Community Profile	Specification for dataset description using RDF [21]
eInfraCentral Service Description Template	Information model for European eInfrastructure services (including software services) [28]
DataCite Metadata Schema	XML schema and guidelines of core metadata properties for resource identification, citation, and retrieval [29]
OpenAIRE Application Profile	Guidelines for software repository managers [30]
CodeMeta Metadata Crosswalk	Vocabulary for software metadata concepts and crosswalk between software metadata projects [31]
Schema.org Vocabulary	Controlled vocabulary for marking up web pages [32]
Bioschemas Tool Profile	Schema.org specification for tools in the life sciences [33]
FORCE11 Software Citation Principles	Basic metadata requirements for software citation [34]

Various initiatives for software metadata of relevance to biotoolsSchema are described.