Does a Java open source library exist for the administration of a controlled vocabulary in XML or SKOS format according to NISO/ANSI Z39.19 specification?

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Yes, there are several open source libraries available for the administration of a controlled vocabulary in XML or SKOS format based on the NISO/ANSI Z39.19 specification. Some of the popular ones are:

1. SKOS API: This library provides an API for working with SKOS (Simple Knowledge Organization System) vocabularies. It allows users to create, read, update, and delete SKOS concepts and concept schemes.

2. Apelon Distributed Terminology System: This library provides a set of tools for working with controlled vocabularies and terminologies in various formats including SKOS. It supports a range of features such as hierarchical relationships, mappings, and versioning.

3. TemaTres: This is an open source software application for managing controlled vocabularies in SKOS format. It provides a web-based user interface for creating, editing, and browsing vocabularies.

4. PoolParty: This is a semantic technology platform that provides a range of tools for working with controlled vocabularies, including the creation and management of SKOS-based taxonomies. It also includes features such as ontology management and text mining.

These libraries can be used to manage controlled vocabularies in various domains such as healthcare, education, and cultural heritage. They offer a range of features and functionalities that can be customized to fit specific requirements.