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N-Triples is a line based serialization format for an RDF graph. Each line represents the subject, predicate and object of an RDF Triple separated by whitespace and ended with a dot like:
<http://one.example/subject1> <http://one.example/predicate1> <http://one.example/object1> .
More details can be found here: http://www.w3.org/TR/n-triples/
But why is it necessary to define such a format, if one could serialize RDF Triples simply using CSV like
http://one.example/subject1, http://one.example/predicate1, http://one.example/object1
I could even easily extend to support N-Quads, N-Quints, ... using CSV. What are the advantages of N-Triples over CSV for serializing RDF triples?
Disclaimer: I'm the original editor of N-Triples and implemented it in Raptor http://librdf.org/raptor/ both the N-Triples original and the 2013 version.
There are multiple answers to this but it's basically ambiguity. CSV can't distinguish between a URI that looks like http://foo.com/ and a string http://foo.com/
In CSV
http://foo.com/,http://foo.com/,http://foo.com/
this could be a triple
(URI http://foo.com/, URI http://foo.com/, URI http://foo.com/)
or
(URI http://foo.com/, URI http://foo.com/, Literal http://foo.com/)
N-Triples adds <> and "" for distinguishing these cases
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Why doesn't JSON tolerate a trailing comma after the last element?
[
{
"id": 1,
"username": "john"
},
{
"id": 2,
"username": "william"
}
]
Be it a comma after the value "John" or be it the second JSON user object, why is JSON not tolerating the comma? Don't we have a simple engineering solution that can solve this tiny problem and by the way we are in the "Deep Learning" era. I am more curious to know why does it exist.
An array structure is represented as square brackets surrounding
zero or more values (or elements). Elements are separated by
commas.
array = begin-array [ value *( value-separator value ) ] end-array
There is no requirement that the values in an array be of the same
type.
RFC 7159 section 5
Effectivly, trailing commas are not allowed as defined by the specification.
There are linting tools which will automagically fix it for you, but it's usually a sign you've done something wrong.
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I have a Rust library and Ruby project. I call a Rust function from Ruby via FFi.
There's a function in the Rust library that receives a string and converts it into json.
Ruby side:
my_json_raw_str = {
network: {
server_address: "my_server.com"
}
}
res = send_it_to_rust(my_json_raw_str.to_json)
A function in Rust will throw an exception when parsing json string sent to it from Ruby.
An error returned from Rust:
Invalid parameters: trailing characters at line 1 column 47\nparams: [{\"network\":{\"server_address\":\"my_server.com\"}}\u0000]
Json is valid, isn't it?
serde, serde_json and serde_derive are used on Rust side.
How to fix the error and why is it caused?
Json is valid, isn't it?
Your JSON is not valid, because your FFI layer is not correct: if you look at the error it's clearly telling you that there is a trailing NUL byte in your data, meaning when bridging between C and Rust you left the trailing NUL byte from the C string.
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I have a JSON String to validate which contains two separate objects. The string is "1A" but i want to validate it as individual objects for example: {"NumberInt":1,"LetterThing":"A"}.
In conclusion, my string is "1A" but I need to validate it as individual objects despite the fact it's in a string format.
Why do I want this? I have a minimum and maximum for the NumberInt integer value and I have a particular pattern for the LetterThing string value. For example: I do not want "5H" to validate.
If this is possible in a string format please let me know how.
Solved:
Was solved by using regex to validate on my JsonSchema i.e "pattern": "^[A-Ja-j1-4\\s]*$".
Thanks guys
You could use a regex to extract what you need from the JSON.
//obtains the number part, then you can perform operations on that number
var startingDigits = incomingString.replace( /^\D+/g, '');
You would need to PARSE the string in this case.
To parse a STRING you ITERATE over each CHARACTER in the string and then compose the needed parsed ELEMENTS.
For example in this CASE you might start looking for only DIGITS and putting them in another string. When you hit a LETTER you can CONVERT that string to an integer.
Then take the REMAINING as the 2nd part.
Finally do your VALIDATION.
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In many languages multiline String literal syntax is
"""
Hello
World
"""
But why it require a new syntax, why just not to use " instead of """ ?
Like:
"Hello
World"
I think this is primarily to allow nested double quotes:
"""
Hello, "World"
"""
If " was used for multiline strings, then you had to escape nested quotes which is a bit inconvenient.
You can simply include formatted code like this:
val text = """
for (c in "foo")
print(c)
"""
or use special chars like " without the need to escape. It's very neat when it comes to JSON for example.
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I have response from server in this format :
{
"id":"552cd25444ae47fe5f3a41b2",
"eventType":"REST_EVENT",
"userSid":"REST_USER",
"content":{
"key":"value",
"key1":"value1",
"key2":"value2"
}
}
How I can map content field to Ember Data Model if this field has dynamic count of values and without knowing key names ?
Its really simple. Use this in your model
content : DS.attr()
Ember will automatically pick up if you pass array, string or number. In your case array.
You can even iterate over it. Watch it using Observers like any other array or model attribute in Ember.