2015, and the four corpora 6 used in the shared task on word-level language detection in code-switched text (Solorio et al., 2014) organized by the workshop on Computational Approaches to Code Switching at the 2014 Conference on Empirical Methods in Natural Language Processing (EMNLP).
so does the annotation strategy chosen for the EMNLP corpora prescribe that elements such as abbreviations should be tagged with the language they belong to, while other annotations schemes treat them as language independent.