XML document authoring with emacs nxml-mode

emacs has an internal variable named rng-schema-locating-files that tells it all the places to search for schema locating files. This variable's default value is ('schemas.xml', 'DIST-DIR/schema/schemas.xml'), where DIST-DIR is the distribution directory where nxml is installed.

The schemas.xml file in the distribution directory handles many of the common cases such as XSLT files or DocBook documents.

You can also have a schemas.xml file in the same directory as the document you are working on. This file is also a schema locating file.

Each schema locating file specifies rules for associating files with schemas. The rules can use the file's extension (such as .xsl) or the file's root element (such as <article>) to infer the correct schema. If all else fails, it can simply specify “file x uses schema y.”