About RDF query

1. http://www.w3.org/2001/11/13-RDF-Query-Rules/
This document provides a survey of RDF query language and implementations and describes their capabilities in terms described in RDF Query and Rules Framework.

2.SPARQL: A query platform for Web 2.0 and the Semantic Web

A full list of different query language implementations can bee seen at http://www.w3.org/2001/11/13-RDF-Query-Rules/. But these languages lack both a common syntax and a common semantics. In fact, the existing query languages cover a significant semantic range: from declarative, SQL-like languages, to path languages, to rule or production-like systems. And SPARQL had to fill this gap.

vocabulary

1. generative v.s. discriminative
2. inductive v.s. recursive

about Kernel method

tutorial on kernel method

Bernhard Schölkopf. Statistical learning and kernel methods. MSR-TR 2000-23, Microsoft Research, 2000.

Kernel methods retain te original representation of objects and use the object in algorithms only via computing a kernel function between a pair of objects. A kernel function is a similarity function satisfying certain properties. More precisely, a kernel function K over the object space X is binary function K:X*X ->[0, infinite] mapping a pair of objects x,y \in X to their similarity score K(x,y). A kernel function is required to be symmetric and positive-semidefinite.

NOTE: enable curl extension from PHP

出处在这里

版本：php5.05
@已经内置有php_curl.dll,在ext目录下,此DLL用于支持SSL和zlib.
@在php.ini中找到有extension=php_curl.dll, 去掉前面的注释.
@设置extension_dir=c:\php\ext,
@将:libeay32.dll, ssleay32.dll, php5ts.dll, php_curl.dll 都拷贝到system32目录下 (或将这些文件的目录加入系统的path变量中)
@重启apache/IIS即可.

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查看curl的版本：

＜? php
print_r(curl_version());
?>