reference

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        When a reference is unloaded, a reference node keeps track of the changes
        made to objects in the reference file. When the reference is reloaded,
        the changes stored in the reference node are retored to the reference.

        Reference nodes store connections between attributes in a scene and
        attributes in the reference; connections between attributes contained
        in the reference, but that are not part of the reference file; dynamic
        attributes on node in the reference file, but where the attributes
        were not defined in the reference file; setAttrs made after the file
        was referenced; and internal broken reference connections.

        There are four lists of changes that are saved: Connections, setAttrs,
        addAttrs, and broken connections.

        The connections list is a compound
        multi, with one child being a generic attributes which can be connected
        and the other being the name of the attribute in the reference file that
        used to be connected.

        The setAttr list is a multi with a command which sets an attribute to
        its state before the reference was unloaded.

        The addAttr list is a multi of strings, where each string is a command
        to add an attribute to a referenced node.

        The brokenConnection list is a multi of strings, when each string is a
        command to break a referenced connection.

addAttrList, brokenConnectionList, connection, connectionAttr, connectionList, deleteAttrList, edits, fileNames, fosterParent, fosterSiblings, locked, multiParent, multiParentList, parentList, placeHolderList, proxyMsg, proxyTag, setAttrList, sharedReference, unknownReference

Long name (short name)	Type	Default	Flags
fileNames (fn)	string	NULL
This attribute is a list of files used by the reference. The purpose is to maintain a list to quickly swap maya files without needing a file browser.
connectionList (cl)	compound	n/a
This multi compound stores a connection and a string with the name of the attribute that used to be on this end of the connection.
connectionAttr (ca) string NULL The name of the attribute that used to be connected before the reference was unloaded.
connection (c) Generic NULL A generic attribute used to keep a connection when the reference is unloaded.
setAttrList (sl)	string	NULL
A list of setAttr commands.
addAttrList (al)	string	NULL
A list of addAttr commands.
deleteAttrList (dl)	string	NULL
A list of deleteAttr commands.
brokenConnectionList (bl)	string	NULL
A multi containing strings which are executed to break internal connections in a reference file.
parentList (pl)	string	NULL
A list of parent commands.
fosterParent (fp)	Message	n/a
This message attribute allows a connection from the foster parent transform to the referenceNode. Since there is at most one foster parent transform per referenceNode, we use this attribute to determine the foster parent associated with a reference node.
fosterSiblings (fs)	Message	n/a
This message attribute allows a connection to this referenceNode from each intermediate node of its foster parent. An intermediate node is created when a there are multiple nodes with the same name that need to be parented to the foster parent (i.e. when a main scene node has been instanced under a referenced node).
placeHolderList (phl)	Generic	NULL
A generic attribute used to keep a connection when the reference is unloaded.
multiParentList (mpl)	compound	n/a
A generic attribute used to keep a connection between multi parents when the reference is unloaded. This is a multi compound containing a multi (aMultiParent) as its compound child. aMultiParent is actually used to stored the connection.
multiParent (mp) Generic NULL A generic multi attribute used to keep a connection between multi parents when the reference is unloaded.
edits (ed)	referenceEdits	NULL
This attribute stores information about the modifications ("edits") that have been made to nodes in thereference. This attribute should not be accessed directly - please use the "List Reference Edits..." window, referenceEdit command, and referenceQuery command instead.
proxyTag (ptag)	string	NULL
This string is the proxy tag associated with this reference.
proxyMsg (pmsg)	Message	n/a
This message attribute allows a connection from the proxy manager to the reference node when the reference node is being used as a proxy.
unknownReference (ur)	Message	n/a
This message attribute is used to connect a particular scenefile's unknown reference node to all the other reference nodes in that scenefile.
sharedReference (sr)	Message	n/a
This message attribute is used to connect a particular scenefile's shared reference node to all reference nodes in that scenefile which contain shared nodes.
locked (lk)	bool	false
This attribute is set when bringing in a reference file and is not editable after that.