computer science

MeCard (QR code)

MeCard (QR code) is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand MeCard (QR code) rather than just read about it. In short: MeCard is a data file similar to vCard but used by NTT DoCoMo in Japan in QR code format for use with Cellular Phones. It is largely compatible with most QR-readers for smartphones.

Key takeaways

MeCard (QR code) belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect MeCard (QR code) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of MeCard (QR code) from memory before moving on to harder problems.

Reference excerpt

MeCard is a data file similar to vCard but used by NTT DoCoMo in Japan in QR code format for use with Cellular Phones. It is largely compatible with most QR-readers for smartphones. It is an easy way to share a contact with the most used fields. Usually, devices can recognize it and treat it like a contact ready to import. MeCard is based in UTF-8 (which is ASCII compatible); the fields are separated with one semicolon (;), and the tags are separated with a colon (:). Compared to vCard, it needs very few chars due to the size limitation of QR Codes.

Limitations Compared to vCard, MeCard format only stores one single contact, a few labels, and a few data pieces to be set in a typical phonebook. There is no place on the web that defines a standard for MeCard. It is not described by the ISO, nor is there an RFC for it. As of 2016, the page at NTT DoCoMo that originally defined the layout returns 404, and searching their web site for "MeCard" turns up only a few unrelated references.

Structure MeCard format starts with the tag MECARD and it finishes with two semicolons (;;) The supported tags include:

Note on the ADR: field: Although the original NTT DoCoMo page described the format as shown, in practice almost no QRCode apps that recognize MeCards decompose the address as a set of comma separated fields. They instead display the contents of the field directly. This indicates that, in practice, the field should be formatted according to local layout conventions.

External links NTT DoCoMo MECARD format and example at the Wayback Machine (archived 4 March 2016) [1] QR Code MeCard online generator MECARD QR code generator MeCard offline generator

Illustrations

Worked examples

Example 1 — a first encounter with MeCard (QR code)

Start with the simplest possible case. Write down what MeCard (QR code) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to MeCard (QR code) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about MeCard (QR code) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of MeCard (QR code)

In research: MeCard (QR code) appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses MeCard (QR code) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: MeCard (QR code) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Algorithms and data structures stubs, Automatic identification and data capture, Barcodes, so understanding it makes those chapters shorter.
In everyday life: Look for MeCard (QR code) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study MeCard (QR code) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what MeCard (QR code) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain MeCard (QR code) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is MeCard (QR code) in simple terms?

MeCard is a data file similar to vCard but used by NTT DoCoMo in Japan in QR code format for use with Cellular Phones. It is largely compatible with most QR-readers for smartphones.

Why does MeCard (QR code) matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study MeCard (QR code)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on MeCard (QR code).