What are application identifiers?

A bundle ID or bundle identifier uniquely identifies an application in Apple's ecosystem. This means that no two applications can have the same bundle identifier. To avoid conflicts, Apple encourages developers to use reverse domain name notation for choosing an application's bundle identifier.

Read more | Barcode Identifiers: What Are They & How to Use Them Properly

Let's take Cocoacasts as an example. Every application I build for Cocoacasts has a bundle identifier that starts with com.cocoacasts, that is, the reverse of the Cocoacasts website. For my company, Code Foundry, I use bundle identifiers that start with be.codefoundry.

You don't need to own the domain you use for your application's bundle identifier. The domain is only used to ensure the bundle identifier is unique. For example, I could also use blog.cocoacasts for the applications I build for Cocoacasts even though I don't own cocoacasts.blog.

To create a unique bundle identifier, you append the name of the application to the reversed domain, for example, com.cocoacasts.scribbles. Remember that you choose the bundle identifier. Reverse domain name notation is what Apple recommends and it's a pattern most developers use.

The only requirement is that the bundle identifier is unique. Xcode warns you if you choose a bundle identifier that's already in use by another application. I strongly recommended that you use a bundle identifier that makes sense and that's why most developers stick to reverse domain name notation.

If you're building a suite of applications, then you can use the same approach. Take a look at the following example. The first bundle ID is used for the iOS client of Scribbles whereas the second bundle ID is used for the macOS client of Scribbles.

Related blog post:

• https://barcodetypes.blogspot.com/2022/11/what-is-zion-web5-social-network-app.html
• https://barcodetypes.blogspot.com/2022/11/what-are-decentralized-identifiers.html
• https://barcodetypes.blogspot.com/2022/11/what-are-decentralized-web-nodes.html

What is AI in barcode?

An element string is the combination of a GS1 Application Identifier and a GS1 AI data field. The data following an AI can be alphanumeric or numeric and with fixed or variable data lengths. The symbology character FNC1 is used as field separator.

If an AI is of variable length type, you have to terminate the field with FNC1.

FNC1 is specified in the barcode data with the escape sequence “\F”. For encoding the FNC1, you have to activate Translate Escape Sequences in the bar code generator.

There are AIs that have additional syntax restrictions, e.g., numerical only - see table above.

Use FNC1 only with variable length data fields and omit the FNC1 after the last data field.

Note that some applications, which utilize GS1 DataMatrix, need an ASCII Code 1DHex instead of FNC1 (follow your specification).

Do not encode the brackets, which are usually used to denote an Application Identifier. TEC-IT software generates the brackets automatically for the human readable text. The brackets are not encoded in the barcode itself!

What is the meaning of GS1 in barcode?

For Foodservice, the industry has agreed on 3 key components:

(01) Global Trade Item Number (GTIN)

Global Trade Item Numbers (GTINs) are globally unique identifiers for products that are encoded into the barcode. The GTIN is a 14 digit identifier comprised of four components: 1) Indicator Digit, 2) Your GS1 Company Prefix, 3) Item Reference Number, 4) Check Digit.

(AI) Date Information

The foodservice industry has agreed upon the use of 5 types of date information for the GS1-128: production date, packaging date, best before date, sell by date, or expiration date.

(10) Batch/Lot

Batch/Lot: A unit of production, inspection, and/or shipment that is uniform in terms of quantity across lots, or components within batches.

The parenthetical numbers in the barcode denote the Application Identifier (AI). AIs are two-digit numerical prefixes that correlate to specific data elements. AIs are used in barcodes and EPC-Enabled RFID tags to signify the specific type of data being relayed. Read the Voluntary GS1-128 Barcode Guideline to reference the AIs used in the Foodservice Industry.

What is a GS1 identifier?

An identifier is a name that identifies (that is, labels the identity of) either a unique object or a unique class of objects, where the "object" or class may be an idea, physical countable object (or class thereof), or physical noncountable substance (or class thereof). The abbreviation ID often refers to identity, identification (the process of identifying), or an identifier (that is, an instance of identification). An identifier may be a word, number, letter, symbol, or any combination of those.

The words, numbers, letters, or symbols may follow an encoding system (wherein letters, digits, words, or symbols stand for [represent] ideas or longer names) or they may simply be arbitrary. When an identifier follows an encoding system, it is often referred to as a code or ID code. For instance the ISO/IEC 11179 metadata registry standard defines a code as system of valid symbols that substitute for longer values in contrast to identifiers without symbolic meaning. Identifiers that do not follow any encoding scheme are often said to be arbitrary IDs; they are arbitrarily assigned and have no greater meaning. (Sometimes identifiers are called "codes" even when they are actually arbitrary, whether because the speaker believes that they have deeper meaning or simply because they are speaking casually and imprecisely.)

The unique identifier (UID) is an identifier that refers to only one instance—only one particular object in the universe. A part number is an identifier, but it is not a unique identifier—for that, a serial number is needed, to identify each instance of the part design. Thus the identifier "Model T" identifies the class (model) of automobiles that Ford's Model T comprises; whereas the unique identifier "Model T Serial Number 159,862" identifies one specific member of that class—that is, one particular Model T car, owned by one specific person

Read more : barcode indentifiers