From Open Babel
@ARTICLE{rr99,
author = {P. Murray--Rust and H. S. Rzepa},
title = {Chemical {M}arkup, {XML}, and the {W}orldwide {W}eb. 1. {B}asic {P}rinciples},
journal = {J. {C}hem. {I}nf. {C}omput. {S}ci.},
year = {1999},
volume = {39},
pages = {928--942},
abstract = {Chemical markup language ({CML}) is an application of {XML}, the extensible
markup language, developed for containing chemical information components
within documents. {I}ts design supports interoperability with the
{XML} family of tools and protocols. {I}t provides a base functionality
for atomic, molecular, and crystallographic information and allows
extensibility for other chemical applications. {L}egacy files can
be imported into {CML} without information loss and can carry any
desired chemical ontology. {S}ome applications of {CML} ({M}arkush
structures, chemical searching) will be discussed in later articles.
{A}n {XML} document type declaration ({DTD}) for {CML} is included
as a {C}hart.},
doi = {10.1021/ci990052b},
}