@inproceedings{schafer-2006-middleware,
    title = "Middleware for Creating and Combining Multi-dimensional {NLP} Markup",
    author = {Sch{\"a}fer, Ulrich},
    booktitle = "Proceedings of the 5th Workshop on {NLP} and {XML} ({NLPXML}-2006): Multi-Dimensional Markup in Natural Language Processing",
    year = "2006",
    url = "https://aclanthology.org/W06-2714/"
}