moving toward the esw wiki
See also: an index of web architecture terms, a glossary of web terms.
Some services make information available via the web, but not addressable. For example, results of database queries using POST (rather than GET) are not addressable. A items in a catalog put on the web this way can't be linked to, and cannot participate in third-party search services. This unfortunate choice by some information providers reduces automation and scalability in the web.
It is also unfortunate that, for example, headings in HTML documents are not addressable unless they are marked up as anchors explicitly. See XML above.