Minecraft wiki entry for Command_NBT_tags, associated text: NBT tags can be specified for items and entities created with the /give and /summon commands. Each tag has the format <tagname>:<value>; where <tagname> describes what it does and <value> is how much it applies. Multiple tags are separated by commas. (e.g.: {Enchantments:[{}],display:{}}). The contents of List tags are enclosed in square brackets [], while the contents of Compound tags are enclosed in curly brackets {} – note that the entire data tag is itself a Compound tag (All within a set of {}). Tag names are case-sensitive, and white space is ignored. additionally, some tags are either true or false (Example: {NoAI:1})