science

Graph Style Sheets

Graph Style Sheets 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 Graph Style Sheets rather than just read about it. In short: GSS (Graph Style Sheets) in mathematics and computing, is an RDF (Resource Description Framework) vocabulary for representation of data in a model of labeled directed graph. Using it will make a relatively complex data resource modeled in RDF, much easier to understand by declaring simple styling and visibility instructions to be applied on selected resources, literals and properties.

Key takeaways

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

Reference excerpt

GSS (Graph Style Sheets) in mathematics and computing, is an RDF (Resource Description Framework) vocabulary for representation of data in a model of labeled directed graph. Using it will make a relatively complex data resource modeled in RDF, much easier to understand by declaring simple styling and visibility instructions to be applied on selected resources, literals and properties.

Introduction GSS (Graph Style Sheets) are proposed in order to visually transform the graphs: filtering information, providing alternative layouts for specific elements, and using all available visual variables to encode information, so as to visualise data in a way that better lends itself to human perception. In summary, GSS (Graph Style Sheets) have been designed for the purpose of filtering, grouping and styling of information elements through specification of declarative transformation rules. GSS not only associate styles to node-edge representation of RDF models, but also can be used to hide part of the graph and offer alternative layouts for some intended elements. The language lets you change the shape (including bitmap icons) of nodes in the graph, change font attributes or stroke properties, and group some or all properties associated with a resource in a table and sort them. A relatively complex RDF model declares styling and visibility instructions to be applied to selected resources and properties in order to improve readability.

The GSS Language GSS is a stylesheet language for styling data modeled in RDF and features a cascading mechanism. Its transformation model is loosely based on that of XSLT and its instructions resemble some existing W3C Recommendations such as CSS and SVG. In particular most of the GSS properties accept all values defined by the CSS 2 and SVG 1.0 Recommendations. Any transformation rule of GSS is made of a selector-instruction pair. The left-hand side of a rule is called selector and the right-hand side is called the instruction. Such sets of rules are collected in a stylesheet (or several cascading stylesheets) and the application (a GSS engine) responsible for styling RDF model, evaluates relevant rules on data model (resources, literals and properties) while walking it; that is, if the selector of a rule matches a node (or edge) in the data model, its set of styling instructions are applied to that node (or edge). Conflicts between rules matching the same node (or edge) are resolved by giving different priority to rules in the stylesheets and most specific selector if conflicting rules are in the same stylesheet.

Tools for manipulating GSS IsaViz 2.0 is equipped with a GSS Editor, which lets you create stylesheets without writing a single line of RDF.

References

Worked examples

Example 1 — a first encounter with Graph Style Sheets

Start with the simplest possible case. Write down what Graph Style Sheets 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 Graph Style Sheets 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 Graph Style Sheets 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 Graph Style Sheets

In research: Graph Style Sheets 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 Graph Style Sheets 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: Graph Style Sheets is common in secondary-school and first-year university syllabi. It links to neighbouring topics Resource Description Framework, so understanding it makes those chapters shorter.
In everyday life: Look for Graph Style Sheets 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 Graph Style Sheets in 20 minutes

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

Frequently asked questions

What is Graph Style Sheets in simple terms?

Why does Graph Style Sheets 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 Graph Style Sheets?

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 Graph Style Sheets.