science

Resource Directory Description Language

Resource Directory Description Language is a 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 Resource Directory Description Language rather than just read about it. In short: Resource Directory Description Language (RDDL) is an extension of XHTML Basic 1.0. An RDDL document, called a Resource Directory, provides a package of information about some target.

Key takeaways

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

Reference excerpt

Resource Directory Description Language (RDDL) is an extension of XHTML Basic 1.0. An RDDL document, called a Resource Directory, provides a package of information about some target. The targets which RDDL was designed to describe are XML namespaces. The specification for RDDL has no official standing and has not been considered nor approved by any organization (e.g., W3C). RDDL is designed to allow both human readers and software robots to find any sort of resource associated with a particular namespace. Instead of putting one thing at the end of a namespace URI, RDDL puts a document there that lists all the machine-processable documents that might be available, including:

Document Type Definitions (DTD) XML schemas in a variety of languages (including RELAX, Schematron, W3C XML Schema, TREX, and others) Cascading Style Sheets, XSLT, and other style sheet specifications Specification documents

rddl:resource An RDDL document identifies each related resource by a resource element in the http://www.rddl.org/ namespace, which is customarily mapped to the rddl prefix. This element is a simple XLink (that is, it has an xlink:type attribute with the value simple) and its xlink:href attribute points to the related resource. Furthermore, the xlink:role attribute identifies the nature of the related resource and the optional xlink:arcrole attribute identifies the purpose of the related resource. An optional xlink:title attribute can provide a brief description of the purpose of the link.

External links RDDL home page Cover Pages: Resource Directory Description Language (RDDL) What does a namespace URI locate?

Worked examples

Example 1 — a first encounter with Resource Directory Description Language

Start with the simplest possible case. Write down what Resource Directory Description Language claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In 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 Resource Directory Description Language 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 Resource Directory Description Language 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 Resource Directory Description Language

In research: Resource Directory Description Language appears in 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 Resource Directory Description Language 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: Resource Directory Description Language is common in secondary-school and first-year university syllabi. It links to neighbouring topics HTML, Programming language topic stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Resource Directory Description Language 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Resource Directory Description Language in 20 minutes

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

Frequently asked questions

What is Resource Directory Description Language in simple terms?

Resource Directory Description Language (RDDL) is an extension of XHTML Basic 1.0. An RDDL document, called a Resource Directory, provides a package of information about some target.

Why does Resource Directory Description Language matter?

Because it connects several 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 Resource Directory Description Language?

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 Resource Directory Description Language.