Content Key References
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When compared to direct content references, content key references are done with indirect addressing. You first need to define a key for the topic which contains the reused content and make the content key reference using that key.
Small example of content key referencing
Reusable Component from topic reusables.dita:
<dd id="CPU"> <ul id="ul_lym_bqd_x4"> <li>Minimum - <tm tmtype="tm">Intel Pentium III</tm>/<tm tmtype="tm">AMD Athlon</tm> class processor, 1 <term>GHz</term>.</li> <li>Recommended - Dual Core class processor.</li> </ul> </dd>
Key definition in DITA Map:
<keydef keys="reusable.install" href="reusables/reusables.dita"/>
Content key reference:
<dd conkeyref="reusable.install/CPU"/>
You can read more about how content key references can be inserted in Oxygen here: https://www.oxygenxml.com/doc/ug-editor/#topics/eppo-create-conkeyref.html