What is the difference between red and blue cwm

Back to Login. Return to Login. English Cymraeg Welsh. Loading Maps. Trail Grading. Trail Facilities. Family Friendly. We found 0 results. Do you want to load the results now? Home Cwm Rhaeadr. Your search results. Because of all the things you can then do with it. Here we'll learn some basic ways to use cwm, a command line python program.

There are lots of other processors for RDF information, and cwm is just one we'll use here. It was designed to show the feasibility of everything in the Semantic Web layer cake, so we can go quite a long way with it. It isn't optimized, though, so you may find it too slow to use for large datasets. This is going to be a completely practical how-to, rather than a theoretical analysis of what is going on.

You might like to keep around for reference:. From now on, though, we'll assume you have set up an alias or whatever your system uses to make it available by simply by the command cwm. You can always use the long form if you don't have the short form. Cwm uses the command line as a sequence of operations to perform from left to right.

You can input data, process it and output it. The default is to input and output from the standard input and output. So you can read. The default format at the beginning of the command line is N3. All these examples involve cwm reading the data into a store, and then reading it out. This means that the order of the results will be different sorted and the comments will be lost. There is actually a --pipe option which preserves comments and order, but it only works with flat RDF files, not with rules and other things which need formulae.

Tip : if the comment you are about to write is about one of the things your RDF file is about, make it a rdfs:comment property and it will be carried through the system -- who knows who will find it useful later?

The great thing about RDF which you will soon just assume but you can't do with plain XML documents is that merging data is trivial. This is particulaly useful if the files have used the same URIs for the same concepts. Suppose the first has that someone is attending a meeting which has a given home page. Merging the three gives us an interconnected web, including the fact that the attendee is actuallt chairing the meeting.

Often, you have data in a raw form and the information you want can be deduced from it, and you would like it added to the data set. In uncle. This rule means "whenever someone's father has a brother, then the latter is their uncle". This rule, once is cwm's store, will cause cwm to deduce the uncle information when it runs with the command line option --think.

How could we find those? Well, the test data set USRegionState. This includes the borderstate property which gives a state's neighbors. Contiguous means that you can get there from here by going from state to neighboring US state. Suppose you are starting in Boston. Variants of sundews can be found across the world, except for in Antarctica I wonder why? In Western Australia one species of sundews grows up to 10 metres tall! Fortunately for us, the sundews in Cwm Idwal only grow to around 5 inches tall.

A species that ignores the rules of Artic-Alpine plants is arguably the most famous of them all, the Snowdon lily Gagea Serotina. This is the most important plant in Cwm Idwal and one of the most highly regarded. This is because it is the only place in the United Kingdom where it exists. It is found in grassier parts of the northern hemisphere but it is found here on rocks in Snowdonia. Beyond Cwm Idwal the lily is found hundreds of miles away in the Alps, which begs the question, how on earth did it manage to reach Snowdonia in the first place?

One explanation is that Snowdonia is the furthest place it reached during the last Ice Age and that venturing higher into the colder climates of the north was impossible.