Parameters in Docbook Article

Good afternoon,

I am starting to work with Docbook again after a long time of not using it.

I am trying to find my feet again, and I am sure there is something that I used to do that I cannot work out how to do how so I am hoping you will be able to assist me.

I would like to set a parameter on the command line that sets the client, e.g. --stringparam output.client "ACME" and then use the output.client within the Docbook markup and for ACME to be displayed in the final output.

Is this possible or have I lost I completely lost the plot?

Thanks, Russell