# Metacat: Metadata and Data Management Server

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# 18. Appendix: Development Issues

Metacat is an open source application, and we welcome contributions to the source from members of the community who are interested in helping out. This section will contain a series of technical details about Metacat that will help contributors understand and extend Metacat.

Detailed API documentation for Metacat is available with the release.

Contents:

- 18.1. Identifier Management
  - 18.1.1. Identifier Resolution
- 18.2. DOI Management
  - 18.2.1. DOI Generation
  - 18.2.2. DOI Registration
  - 18.2.3. DOI Registration for deprecated Metacat API
- 18.3. Metacat Usage Statistics Service
  - 18.3.1. Overview
  - 18.3.2. Requirements
  - 18.3.3. Statistics Service Solr Index
  - 18.3.4. Statistics Service Usage
  - 18.3.5. Unresolved Issues/Questions
- 18.4. ORE Model for Derived Data Packages
  - 18.4.1. Overview
  - 18.4.2. Ontology and Model
  - 18.4.3. Examples
  - 18.4.4. Sample RDF
  - 18.4.5. Indexing