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Chapter 11. Using sgml-mode with Emacs

Recent versions of Emacs or Xemacs (available from the ports collection) contain a very useful package called PSGML. Automatically invoked when a file with the .sgml extension is loaded, or by typing M-x sgml-mode, it is a major mode for dealing with SGML files, elements and attributes.

An understanding of some of the commands provided by this mode can make working with SGML documents such as the Handbook much easier.

C-c C-e

Runs sgml-insert-element. You will be prompted for the name of the element to insert at the current point. You can use the TAB key to complete the element. Elements that are not valid at the current point will be disallowed.

The start and end tags for the element will be inserted. If the element contains other, mandatory, elements then these will be inserted as well.

C-c =

Runs sgml-change-element-name. Place the point within an element and run this command. You will be prompted for the name of the element to change to. Both the start and end tags of the current element will be changed to the new element.

C-c C-r

Runs sgml-tag-region. Select some text (move to start of text, C-space, move to end of text, C-space) and then run this command. You will be prompted for the element to use. This element will then be inserted immediately before and after your marked region.

C-c -

Runs sgml-untag-element. Place the point within the start or end tag of an element you want to remove, and run this command. The element's start and end tags will be removed.

C-c C-q

Runs sgml-fill-element. Will recursively fill (i.e., reformat) content from the current element in. The filling will affect content in which whitespace is significant, such as within <programlisting> elements, so run this command with care.

C-c C-a

Runs sgml-edit-attributes. Opens a second buffer containing a list of all the attributes for the closest enclosing element, and their current values. Use TAB to navigate between attributes, C-k to remove an existing value and replace it with a new one, C-c to close this buffer and return to the main document.

C-c C-v

Runs sgml-validate. Prompts you to save the current document (if necessary) and then runs an SGML validator. The output from the validator is captured into a new buffer, and you can then navigate from one troublespot to the next, fixing markup errors as you go.

Doubtless there are other useful functions of this mode, but those are the ones I use most often.

For questions about FreeBSD, e-mail <questions@FreeBSD.org>.
For questions about this documentation, e-mail <doc@FreeBSD.org>.




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