computer science

XHTML Friends Network

XHTML Friends Network 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 XHTML Friends Network rather than just read about it. In short: XHTML Friends Network (XFN) is an HTML microformat developed by Global Multimedia Protocols Group that provides a simple way to represent human relationships using links. XFN enables web authors to indicate relationships to the people in their blogrolls by adding one or more keywords as the rel attribute to their links.

Key takeaways

XHTML Friends Network 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 XHTML Friends Network to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of XHTML Friends Network from memory before moving on to harder problems.

Reference excerpt

XHTML Friends Network (XFN) is an HTML microformat developed by Global Multimedia Protocols Group that provides a simple way to represent human relationships using links. XFN enables web authors to indicate relationships to the people in their blogrolls by adding one or more keywords as the rel attribute to their links. XFN was the first microformat, introduced in December 2003.

Example A friend of Jimmy Example could indicate that relationship by publishing a link on their site like this:

<a href="http://jimmy.example.com/" rel="friend">Jimmy Example</a> Multiple values may be used, so if that friend has met Jimmy:

<a href="http://jimmy.example.com/" rel="friend met">Jimmy Example</a>

Worked examples

Example 1 — a first encounter with XHTML Friends Network

Start with the simplest possible case. Write down what XHTML Friends Network 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 XHTML Friends Network 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 XHTML Friends Network 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 XHTML Friends Network

In research: XHTML Friends Network 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 XHTML Friends Network 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: XHTML Friends Network is common in secondary-school and first-year university syllabi. It links to neighbouring topics Markup language stubs, Microformats, Semantic HTML, so understanding it makes those chapters shorter.
In everyday life: Look for XHTML Friends Network 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 XHTML Friends Network in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what XHTML Friends Network 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 XHTML Friends Network out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is XHTML Friends Network in simple terms?

Why does XHTML Friends Network 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 XHTML Friends Network?

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 XHTML Friends Network.