App-V Team published an article about App-V integration in Citrix XenApp.  This one describes how to publish an App-V-enabled application in Citrix XenApp:

To publish an App-V-enabled application in Citrix XenApp, follow these steps:

1. Publish Sfttray.exe or publish Sftrun.exe.
2. Publish the .OSD file.
3. Publish the application name followed by a percent sign and then an asterisk (%*) or publish the application name and version followed by a percent sign and then an asterisk.

To continue reading and see all the details check out the Knowledge Base article below:

KB931576 – How to publish an App-V-enabled application in Citrix XenApp