Rigth now discovery of PubSub node returns only pubsub#title values which is not what XEP-0060 - Discover Node Metadata suggests:

The "disco#info" result MAY include detailed meta-data about the node, encapsulated in the Data Forms ( XEP-0004) [11] format as described in Service Discovery Extensions ( XEP-0128) [12], where the data form context is specified by including a FORM_TYPE of "http://jabber.org/protocol/pubsub#meta-data" in accordance with Field Standardization for Data Forms ( XEP-0068) [13]. If meta-data is provided, it SHOULD include values for all configured options as well as "automatic" information such as the node creation date, a list of publishers, and the like.