Valid XML data objects that can be dragged from one area to another must be one of the following types:
Draggable Items:

WORK_XML i2b2 Type

Description / Name

From View

QUERY_DEFINITION

Query definition

Query Tool (Query Name)

PREV_QUERY

Query formulation

Previous Query

PATIENT_COLL

Patient list, Timeline

Previous Query, Timeline

ENCOUNTER_COLL

Encounter set

Previous Query

GROUP_TEMPLATE

Set of concept specifications

Query Tool (Group label)

CONCEPT

Single term

Ontology, Query Tool, Timeline

PATIENT

Single patient

Previous Query

OBSERVATION

Single patient observation

Timeline View - Notes viewer

EVENT

Single patient event

TBD

OBSERVER

Single observer

TBD

PDO

Set of multiple patient data types

TBD

XML_RESULTS

Generic query result

Previous Query (Patient count)