You can use DITA ALink PI markers to insert ALink keywords. The content of the PI marker is an ALink keyword that identifies the ALink set to which the topic belongs. An ALink keyword is case sensitive, and must consist of a single alphanumeric term, without punctuation. However, in OmniHelp (only), spaces are allowed in ALink keywords, and you can include as many keywords as you want in a single ALink PI marker, separated by semicolons.
You can provide ALink PI markers to use for ALink keywords by inserting PIs in DITA XML with the following content: