Basically, Tom Harrington was saying that you can get location card or location URL.
To get the location URL,
Make "NSExtensionActivationRule" Key type as "String" and in the value add the SUBQUERY given by Tom Harrington.
Here, All the extension Item go through this Query and shows up your extension in the UIActivityView, If your query conforms with the Extension Item.
Your Info.Plist should look something like this:
<Key>NSExtensionActivationRule</key>
<string>SUBQUERY(extensionItems,$extensionItem,SUBQUERY($extensionItem.attachments,$attachment,SUBQUERY($attachment.registeredTypeIdentifiers, $uti, $uti UTI-CONFORMS-TO "public.url" AND NOT $uti UTI-CONFORMS-TO "public.file-url").@count >= 1).@count >= 1).@count >= 1</string>
If you want to support other UTTypes as well, Then use OR and add other SUBQUERY.
Hope that Helps.