How to collect a contact database of organizations by topic?

Question

Database

It is necessary to update the database of potential clients-organizations. Can you please tell me how to do parsing for a beginner? Thank you.

Answer 1

PHP :
querypath.org
https://code.google.com/p/phpquery/symfony.com/doc/current/components/dom_crawler.html
https://github.com/amal/CDom
framework.zend.com/manual
/1.12/ru/zend.dom.query.html
PYTHON:
habrahabr.ru/post/127584