There are 2 repositories under metadata-standard topic.
Open Source Java e-Invoicing library, validator and tool (Factur-X/ZUGFeRD, UNCEFACT/CII XRechnung)
A metadata standard for public software
Ecological Metadata Language interface for R: synthesis and integration of heterogenous data
A native Go SDK for the Extensible Metadata Platform (XMP)
A curated list of awesome stuff around the FAIR principles for (scientific) data, i.e that data is findable, accessable, interoperable and re-usable.
Collection template and associated materials for SARS-CoV-2 metadata
MetadataExchange Community Edition
Sony PlayStation Studios' Audio Standards Working Group - iXML Extension
A Single place to Discover, Collaborate, and Get your data right
The 4DN + BINA Tiered System of Microscopy Metadata Guidelines was developed by the 4DN Imaging Standards Working Group in collaboration with the BINA Data Management and Quality Control Working Group (https://www.bioimagingna.org/qc-dm-wg) for documenting microscopy experiments and assessing the quality of image data.
A lightweight web-based ISA-Tab viewer for multiple ISA-Tab files.
CMS code.json: An agency-wide metadata standard for software projects
Repo hosting the FAIRtracks landing page.
Mmetadata specification for Expressions of Peace based on Proof of Peacemaking
A metadata schema for the Minimum Information about Intermicrobial Interaction Data (MIIID) using LinkML
This is a converter written in Java that translates an XSD microscopy metadata schema into JSON
XSL transformations used to edit metadata in preparation for ingest into a digital repository.
Examples of SDTL embedded in ProvONE
4DN-BINA-OME-QUAREP Microscopy Glossary
A set of scripts to migrate metadata from FileMaker to MARC for batch loading to the library OPAC
DTD for alternate Gentoo metadata (metadata-alt)
A KnowLedger ecosystem repository for module development enabling research workflow functionality in the KnowLedger software
Harvesting infrastructure to collect and standardize dataset and computational tool metadata
Schemas developed to standardize metadata for the NIAID Data Ecosystem
Manuale RNDT
schema definition for metadata catalogs (xsd)