@misc{1196496,
  author = {Bruce K Rosen and Fontaines Isabella des},
  title = {Guide to schema and schema extensibility:},
  year = {1991},
  month = {1991-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.SP.500-197},
  language = {en},
}