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Oxygen XML Editor provides a Content Completion Assistant that provides a list of available options at any point in a document and can auto-complete structures, elements, and attributes. To configure the Content Completion preferences, open the Preferences dialog box (Options > Preferences) and go to Editor > Content Completion. These options control how the Content Completion Assistant works.

The following options are available:
Auto close the last opened tag
When selected, Oxygen XML Editor automatically closes the last open tag when you type </.
Automatically rename/delete/comment matching tags
If you rename, delete, or comment out a start tag, Oxygen XML Editor automatically renames, deletes, or comments out the matching end tag.
Note: If you select Toggle comment for multiple starting tags and the matching end tags are on the same line as other start tags, the end tags are not commented.
Enable content completion
Toggles the content completion feature on or off.
Close the inserted element
When you choose an entry from the Content Completion Assistant list of proposals, Oxygen XML Editor inserts both start and end tags. The following additional options are available in regards to closing the element:
  • If it has no matching tag - The end tag of the inserted element is automatically added only if it is not already present in the document.
  • Add element content - Oxygen XML Editor inserts the required elements specified in the DTD, XML Schema, or RELAX NG schema that is associated with the edited XML document.
    • Add optional content - If selected, Oxygen XML Editor inserts the optional elements specified in the DTD, XML Schema, or RELAX NG schema.
    • Add first Choice particle - If selected, Oxygen XML Editor inserts the first choice particle specified in the DTD, XML Schema, or RELAX NG schema.
Case sensitive search
When selected, the search in the Content Completion Assistant is case-sensitive when you type a character ('a' and 'A' are different characters).
Note: This option is ignored when the current language itself is not case sensitive. For example, the case is ignored in the CSS language.
Position cursor between tags
When selected, Oxygen XML Editor automatically moves the cursor between the start and end tag after inserting the element. This only applies to:
Show all entities
Oxygen XML Editor displays a list with all the internal and external entities declared in the current document when you type the start character of an entity reference (for example, &).
Insert the required attributes
Oxygen XML Editor inserts automatically the required attributes taken from the DTD or XML Schema.
Insert the fixed attributes
If selected, Oxygen XML Editor automatically inserts any FIXED attributes from the DTD or XML Schema for an element inserted with the help of the Content Completion Assistant.
Show recently used items
When selected, Oxygen XML Editor remembers the last inserted items from the Content Completion Assistant window. The number of items to be remembered is limited by the Maximum number of recent items shown list box. These most frequently used items are displayed on the top of the content completion window and are separated from the rest of the suggestions by a thin gray line .
Maximum number of recent items shown
Specifies the limit for the number of recently used items presented at the top of the Content Completion Assistant window.
Learn attributes values
When selected, Oxygen XML Editor learns the attribute values used in a document.
Learn on open document
Oxygen XML Editor automatically learns the document structure when the document is opened.
Learn words (Dynamic Abbreviations, available on Ctrl+Space (Command+Space on OS X))
When selected, Oxygen XML Editor learns the typed words and makes them available in a content completion fashion by pressing Ctrl + Space (Command + Space on OS X) on your keyboard;
Note: In order to be learned, the words need to be separated by space characters.
Activation delay of the proposals window (ms)
Delay in milliseconds from last key press until the Content Completion Assistant is displayed.