Section Editing allows to edit a sub-section of the page only. This makes it easier to change long documents. Section Editing is sometimes called Partial Page Editing.
If you have the rights to do it, each headline (usually only the first 3 levels) starts a new section. When a page is writable a small Edit button appears at the end of the section. Using this button loads only this section into the editor.
In the Admin page, you can set up the maximum level of section editing, so that your page isn't flooded by “edit” buttons. See
Maximum section edit level in your admin page or
maxseclevel in your local.php config file.
Setting up a
maxseclevel of 0 will disable section editing.
If you prefer having your
edit button beside the header, see the plugin
editsections
To edit part of longs sections, you can put sections with no text in it. The button will still appear (if they are not of a level higher than maxseclevel). However this may break you style, so you should then correct your
CSS.
The use of the linebreak plugin may break the section editing mechanism : see
bug
It is not possible, to collaborate on one page with one editing a section and someone else editing another. This is due to the fact that section editing
locks the whole page. This behavior may change in the future as there is no obstacle of locking a part of a page only.