>>> import pystac
>>> 
>>> collection = pystac.Collection.from_file("./tests/data-files/catalogs/cbers-partial/CBERS4MUX/collection.json")
>>> collection.item_assets
{'thumbnail': <pystac.item_assets.ItemAssetDefinition at 0x72aea0420750>,
 'metadata': <pystac.item_assets.ItemAssetDefinition at 0x72aea017dc90>,
 'B5': <pystac.item_assets.ItemAssetDefinition at 0x72aea017efd0>,
 'B6': <pystac.item_assets.ItemAssetDefinition at 0x72aea016d5d0>,
 'B7': <pystac.item_assets.ItemAssetDefinition at 0x72aea016e050>,
 'B8': <pystac.item_assets.ItemAssetDefinition at 0x72aea016da90>}
>>> collection.item_assets["thumbnail"].title
'Thumbnail'
>>> collection.item_assets["thumbnail"].title = "fake"
>>> collection.item_assets["thumbnail"].title
'fake'
>>> collection.item_assets["B4"] = {
    'type': 'image/tiff; application=geotiff; profile=cloud-optimized',
    'eo:bands': [{'name': 'B4', 'common_name': 'red'}]
}
>>>collection.item_assets["B4"].owner == collection
True