Shunsuke Saruwatari

[jena] how to read seq

October 24th, 2007

jena can read seq from rdf file.

If there is following rdf,

<rdf:RDF
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" >
  <rdf:Description rdf:about="http://www.illigal.uiuc.edu/saru">
    <rdf:_3>Uncategorized</rdf:_3>
    <rdf:_2>programming</rdf:_2>
    <rdf:_1>Books</rdf:_1>
    <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#Seq"/>
  </rdf:Description>
</rdf:RDF>

And, you execute following code,

Model model = ModelFactory.createDefaultModel();
InputStream in = FileManager.get().open("sample.rdf");
model.read(in, "");

seq = model.getSeq("http://www.illigal.uiuc.edu/saru");

for(int i = 1; i <= seq.size(); i++){
    System.out.println(i + ": " + seq.getObject(i));
}

output will be

1: Books
2: programming
3: Uncategorized

[jena] how to write seq

October 24th, 2007

JENA can make list using seq on RDF.

Model model = ModelFactory.createDefaultModel();        

Seq seq = model.createSeq("http://www.illigal.uiuc.edu/saru");
seq.add("Books");
seq.add("programming");
seq.add("Uncategorized");

model.write(System.out);

We can create seq by Model::createSeq. Arguments is description URI. If you execute previous code,

<rdf:RDF
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" >
  <rdf:Description rdf:about="http://www.illigal.uiuc.edu/saru">
    <rdf:_3>Uncategorized</rdf:_3>
    <rdf:_2>programming</rdf:_2>
    <rdf:_1>Books</rdf:_1>
    <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#Seq"/>
  </rdf:Description>
</rdf:RDF>

will be output. _1, _2, _3 is order of the objects.

[jena] minimum rdf

October 20th, 2007

Model model = ModelFactory.createDefaultModel();        

model.write(System.out);

this outputs

<rdf:RDF
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" >
</rdf:RDF>

[LAMP + Ajax] naming rule

October 4th, 2007

I couldn’t find naming rule for LAMP + Ajax. So, I am making my naming rule. This rule might reduce bugs in javascript and php.

In HTML tags

tag id attribute must be lower case and finished at “_id”

tag class attribute name must be finished at “_class”

tag name attribute is not added anything.

In Javascript

local variant must be Hungarian notation with mixed lower case and upper case without _

strTopic (string), elmTopic (element), objTopic (object)

global vaiant must be Hungrian notation with only lower case and _

str_topic (string), elm_topic (element), obj_topic (object)

WordPress

[javascript] incident bug

September 30th, 2007

When we use setAttribute, getAttribute, removeAttribute in IE, readonly should be readOnly. Same things happen in maxLength, bgColor, and so on.

[javascript] solve browser incompatibility

September 20th, 2007

Color

use rgb color parser

Event

use Event class in prototype.js

Element

don’t use same tag id name, javascript variable name, and tag class name, and use Element class and $() in prototype.js.
I think we need naming rule at id name, variable name, and class name.
like

• tag id name: xxx_id
• javascript variable: elmXXX (like hangarian style?)
• tag class name: xxx_class

If someone has good idea, please let me know.

[javascript] color compatibility of IE and Firefox

September 19th, 2007

javascript sometimes makes browser depended color compatibility problem.

This javascript library solves the problem.
http://www.phpied.com/rgb-color-parser-in-javascript/

It’s like

var el = document.getElementById("mycolor");
var color = new RGBColor(el.style.backgroundColor);
alert(color.toHex()); // #cccccc
alert(color.toRGB()); // rgb(204,204,204)

[mysql] sql query: combine two table

August 28th, 2007

combine two tables, count specific values, order by the count, and show only top 10.

SELECT table1.comment_id comment_id, count(table1.comment_id) point, parent_id, subparent_id, text FROM table1 LEFT JOIN comments ON table1.comment_id=table2.comment_id WHERE board_id=1 GROUP BY table1.comment_id ORDER BY point DESC LIMIT 10

[eclipse] divide editor window

August 25th, 2007

1. right click editor tab.

2. select “New Editor”.

3. drag down to status bar.

[php] dynamic class loading

August 18th, 2007

When you want to load MyClass via string variant,

$classname = "MyClass";
$object = new $classname();

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