#### 21.6.1 Linking primary content to secondary TOCs

To link a secondary helpset into your primary Eclipse Help system, insert a PI marker of type EclipseLink in the DITA document to be converted to your primary helpset, in the paragraph that immediately precedes the point where you want the secondary helpset to appear. EclipseLink marker content consists of two items separated by a space:

- TOC level number
- Path to the secondary TOC file.

The TOC level number is an integer that corresponds to whatever level number you specified for primary-TOC entries at the same level; see §16.4.3 Setting contents levels for HTML-based Help.

In Eclipse Help output, DITA2Go generates the following from each EclipseLink PI marker:

<link toc="path/to/secondary/toc.xml">

If you do not know ahead of time which secondary helpset (if any) will be needed at a given point in a primary helpset, insert an EclipseLink marker for each possible secondary. In Eclipse version 3.4 and later versions, those <link toc="..."> elements that specify paths to helpsets that are not present at build time are ignored. For Eclipse Help versions earlier than 3.4, see §21.6.2 Linking secondary TOCs to primary content (deprecated).

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21.6.2 Linking secondary TOCs to primary content (deprecated)

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