# RocketRML - A NodeJS implementation of a use-case specific RML mapper

## TL;DR

RocketRML is a NodeJS-based RML mapper tailored for large XML and JSON data, addressing limitations of Java implementations and demonstrating promising performance for real-world Linked Data mapping tasks.

## Contribution

The paper introduces a new NodeJS implementation of an RML mapper optimized for large data sources, expanding the tool's applicability beyond Java-based solutions.

## Key findings

- Performs well with large XML and JSON files
- Shows potential for heavy mapping tasks within reasonable time
- Has limitations with JOINs, Named Graphs, and other input types

## Abstract

The creation of Linked Data from raw data sources is, in theory, no rocket science (pun intended). Depending on the nature of the input and the mapping technology in use, it can become a quite tedious task. For our work on mapping real-life touristic data to the schema.org vocabulary we used RML but soon encountered, that the existing Java mapper implementations reached their limits and were not sufficient for our use cases. In this paper we describe a new implementation of an RML mapper. Written with the JavaScript based NodeJS framework it performs quite well for our uses cases where we work with large XML and JSON files. The performance testing and the execution of the RML test cases have shown, that the implementation has great potential to perform heavy mapping tasks in reasonable time, but comes with some limitations regarding JOINs, Named Graphs and inputs other than XML and JSON - which is fine at the moment, due to the nature of the given use cases.