December 2001
Intermediate to advanced
380 pages
11h 54m
English
Content preview from Python & XMLBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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XPath Functions
XPath provides numerous functions for working with numbers and strings, and allows you to complete transformations and mine XML data without having to constantly bridge other APIs or technologies to do simple string and arithmetic operations. Adding, simple division, multiplication, and string searching are available as built-in functions of XPath.
Working with Numbers
Several XPath functions are available to you. In Example 5-4, multiplication is
used to apply a 20% discount to products. If you need to total a list
of products, you can use the sum
function, working with the same products data again:
<?xml version="1.0" encoding="UTF-8"?>
<products>
<item name="bowl" price="19.95"/>
<item name="spatula" price="4.95"/>
<item name="power mixer" price="149.95"/>
<item name="chef hat" price="39.95"/>
</products> This time, in Example 5-5, you can use a
single XPath expression to generate a total. The expression sum(//@price) returns the sum of the values
of all price elements in the products document. Now go back and modify
the stylesheet you created to discount the products, but this time add
in an xsl:value-of element to
generate a total.
Example 5-5. products.xsl
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<html>
<body>
<table>
<xsl:apply-templates/>
</table>
<p>Your Total:
<xsl:value-of select="sum(//@price)"/> </p> </body> </html> </xsl:template> <xsl:template match="item"> ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.