Nathan Goodman, Oded Shmueli. Syntactic Characterization of Tree Database Schemas. Journal of the ACM, 30(4):767-786, October 1983. [doi]
@article{GoodmanS83:0, title = {Syntactic Characterization of Tree Database Schemas}, author = {Nathan Goodman and Oded Shmueli}, year = {1983}, month = {October}, tags = {XML, XML Schema, database}, researchr = {https://researchr.org/publication/GoodmanS83%3A0}, cites = {0}, citedby = {0}, journal = {Journal of the ACM}, volume = {30}, number = {4}, pages = {767-786}, }