After a number of articles on namespaces bad practices, follow a few that talk of the human in the loop. XML was intended to be human-readable. While that idea may make some people chortle, it is still a worthy goal to design with human readability — and writability — in mind. After all, if all one needs is a way to dump data that is only to be readable by machines in a format available anywhere other options will be faster and simpler, e.g. JSON or YAML. This article is part of a series based the paper on "Designing XML/Web Languages: A Review of Common Mistakes" which I presented at the XML Prague 2009 conference. Many of the mistakes in this section are by no means limited to XML, and tend to apply to other contexts — notably programming — as well, but they are nevertheless worth recalling.