The Network of Terms is a search engine for finding terms in terminology sources (such as thesauri, classification systems and reference lists).

Given a textual search query, the Network of Terms searches one or more terminology sources in real-time and returns matching terms, including their labels and URIs. The Network of Terms offers a simple search interface, handles errors gracefully in case a source does not respond well and harmonizes the results to the SKOS data model.

The Network of Terms is intended for managers of heritage information that want to improve the findability of their information by assigning terms from terminology sources that are used by the institutions in the Dutch Digital Heritage Network. Information managers use the Network of Terms in their collection registration system.

Schematically, the registration system sends out a single query to the Network of Terms, which gets translated to a set of queries that is appropriate for each terminology source. The terms matching the query are harmonized to SKOS and returned to the collection registration system where information managers can evaluate the results and link their data to the terms:

flowchart TD
  crs(Collection registration systems)
  not(Network of Terms)
  ts1("Terminology source 1"):::ts
  ts2("Terminology source 2"):::ts

  style not fill:#D5E8D4,stroke:#82B366
  style crs fill:#FFF2CC,stroke:#D6B656  
  classDef ts fill:#DAE8FC,stroke:#6C8EBF;
  
  crs -- search query ---> not
  not -. search results -.-> crs
   
  not -- search query ---> ts1
  ts1 -. search results -.-> not
  
  not -- search query ---> ts2
  ts2 -. search results -.-> not

If you just want to search the Network of Terms using a web interface, have a look at our demonstrator, a web interface on top of the GraphQL API.

This repository contains the following packages:

• network-of-terms-catalog: the catalog of terminology sources in the Network of Terms that can be queried;
• network-of-terms-cli: query the Network of Terms from the command line;
• network-of-terms-graphql: a GraphQL API to find terms;
• network-of-terms-query: core query logic which executes the queries to terminology sources;
• network-of-terms-reconciliation: a Reconciliation Service API for matching strings against terms with URIs.

You’re very welcome to contribute to this repository:

• create an issue if you encounter a problem or have suggestions;
• read CONTRIBUTING if you wish to commit code.