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What is the difference between RDF and OWL? [closed]
...en to a logical extreme. They have the advantage that you can load triples from many sources into one database with no reconfiguration.
RDF and RDFS
The next layer is RDF - The Resource Description Framework. RDF defines some extra structure to triples. The most important thing RDF defines is a pr...
MySQL Error 1215: Cannot add foreign key constraint
... Explosion Pill's answer covers the basics. You want to make sure to start from there. However, there are more, much more subtle cases to look out for:
For example, when you try to link up PRIMARY KEYs of different tables, make sure to provide proper ON UPDATE and ON DELETE options. E.g.:
...
PRIM...
How do I exclude all instances of a transitive dependency when using Gradle?
...ributes - group and module. However, the above syntax doesn't prevent you from specifying any arbitrary property as a predicate. When trying to exclude from an individual dependency you cannot specify arbitrary properties. For example, this fails:
dependencies {
compile ('org.springframework.dat...
mongoose vs mongodb (nodejs modules/extensions), which better? and why?
...ool?" If you're looking for an object modeling (ODM, a counterpart to ORMs from the SQL world) tool to skip some lower level work, you want Mongoose.
If you want a driver, because you intend to break a lot of rules that an ODM might enforce, go with MongoDB. If you want a fast driver, and can live ...
undefined reference to boost::system::system_category() when compiling
...u 11.10 that uses the Boost libraries. I have the 1.46-dev Boost libraries from the Ubuntu Repository installed, but I get an error when compiling the program.
...
How to make sure that string is valid JSON using JSON.NET
... if the string starts with { or [ and ends with } or ] respectively (added from this answer):
private static bool IsValidJson(string strInput)
{
if (string.IsNullOrWhiteSpace(strInput)) { return false;}
strInput = strInput.Trim();
if ((strInput.StartsWith("{") && strInput.EndsWit...
Executing periodic actions in Python [duplicate]
...o precision of the time module (unlike several of the solutions I've tried from stack exchange).
Note: for Python 2.x, replace next(g) below with g.next().
import time
def do_every(period,f,*args):
def g_tick():
t = time.time()
while True:
t += period
yie...
Java Timestamp - How can I create a Timestamp with the date 23/09/2007?
...milliseconds. Use the static method valueOf if you want to get a timestamp from a string.
– Hazok
Dec 16 '14 at 1:59
4
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Ruby / Rails - Change the timezone of a Time, without changing the value
...ched to t - it assumes that it's local to the time zone you are converting from.
One edge case to guard against here is DST transitions: the local time you specify may not exist or may be ambiguous.
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Should Gemfile.lock be included in .gitignore?
... of new to bundler and the files it generates. I have a copy of a git repo from GitHub that is being contributed to by many people so I was surprised to find that bundler created a file that didn't exist in the repo and wasn't in the .gitignore list.
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