@inproceedings{SchonefeldWitt2016, author = {Schonefeld, Oliver and Witt, Andreas}, title = {Towards validation of concurrent markup}, booktitle = {Proceedings of Extreme Markup Languages 2006}, pages = {11}, year = {2016}, abstract = {XCONCUR allows for the annotations of multiple concurrent hierarchies, but lacks cross-layer validation. This paper explores the requirements for a constraint-based approach for such a validation process.}, language = {en} }