gio:menu-model-item-attribute-value (model index attribute vtype)

model -- a g:menu-model object
index -- an integer with the index of the item
attribute -- a string with the attribute to query
vtype -- a g:variant-type parameter type with the expected type of the attribute, of nil

The g:variant parameter with the value of the attribute.

Queries the item at position index in model for the attribute specified by attribute. If vtype is not nil then it specifies the expected type of the attribute. If it is nil then any type will be accepted.

If the attribute exists and matches vtype, or if the expected type is unspecified, then the value is returned. If the attribute does not exist, or does not match the expected type then nil is returned.