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Chapter 13 CSS Selector Libraries This chapter will review several libraries that are built on top of the XML extensions described in previous chapters. These libraries provide interfaces that uses CSS selector expressions to query markup documents rather than a programmatic API or XPath expressions. Don’t be concerned if you aren’t familiar with CSS selectors, as part of this chapter showcases basic expressions alongside their XPath equivalents. i CSS V e r s i o n s There are multiple versions of the CSS standard and supported selectors vary with each version. This chapter will cover a subset of those available in CSS3. V e r s i o n s of the CSS standard supported by particular libraries are noted where available. A list of differences between the two common versions, CSS2 and CSS3, can be found at http://www.w3.org/TR/css3-selectors/#changesFromCSS2. R e a s o n to U s eThem Before getting into the “how” of using CSS selector libraries, it’s probably best to get the “why” (and “why not”) out of the way first. It goes without saying that these libraries add a layer of complexity to applications that use them, introducing another potential point of failure. They implement expression parsers in order to take CSS
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vi ” CONTENTS Referring URLs . .
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viii ” CONTENTS HTTP Authenticati
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For ewor d W eb scraping is the fut
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Chapter 1 Introduction If you are l
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Chapter 6 P EAR::HTTP_Client The PH
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