My Friday's links

Programming

• Cool URIs don't change, By Tim Berners-Lee ( http://www.w3.org/Provider/Style/URI )

What makes a cool URI?
 A cool URI is one which does not change.
 What sorts of URI change?
URIs don't change: people change them.

• URL as UI, by Jakob Nielsen ( http://www.nngroup.com/articles/url-as-ui/ )

• Hypertext Transfer Protocol -- HTTP/1.1, RFC 2616 , 9 Method Definitions ( http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html )

I discovered the links above by reading the book Pro Asp.Net MVC 4 By Adam Freeman
( http://www.apress.com/9781430265290 )

Programmers

• Programmers: Stop Calling Yourselves Engineers

( http://www.theatlantic.com/technology/archive/2015/11/programmers-should-not-call-themselves-engineers/414271/ )

Reference equality, bitwise equality and value equality

Reference equality means the object references that are compared refer to the same object.

Bitwise equality means the objects that are compared have the same binary representation.

Value equality means the compared objects have the same value even though they have different binary representations. For example, consider two Decimal objects that represent the numbers 1.10 and 1.1000. The Decimal objects do not have bitwise equality because they have different binary representations to account for the different number of trailing zeroes. However, the objects have value equality because the numbers 1.10 and 1.1000 are considered equal for comparison purposes since the trailing zeroes are insignificant.

Further reference : http://msdn2.microsoft.com/en-us/library/bsc2ak47.aspx

XML CDATA

Astazi m-am lovit de urmatoarea problema: parsarea unui text in format xml de catre functia OPENXML intr-o declaratie T-SQL nu pastreaza spatiile la stanga si la dreapta ale textului dintre tagurile unui element.

De exemplu daca am

<separator>  -  </separator>

dupa parsare voi avea valoarea "-" pentru elementul .

Am descoperit ca pentru a pastra spatiile, trebuie sa introduc textul intr-o sectiune xml CDATA ( http://www.w3schools.com/xml/xml_cdata.asp) ca in exemplul de mai jos:

<separator><![CDATA[ - ]]></separator>
Asadar textul format xml va trebui sa-l construiesc astfel in .Net

xml.AppendFormat("
<separator><![CDATA[ - ]]></separator>>", separator);