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adding images and a tree example

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commit 24b68b6fac6ee2b903250d8797e6d0e7d99fa7f2 1 parent fbc7d82
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  1. BIN  html_tree.png
  2. +19 −0 nokogiri.markdown
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19 nokogiri.markdown
@@ -97,6 +97,25 @@ but you should choose the one that is most convenient.
### Data structures
+To become data extraction Zen Masters, we first need to understand the data
+structure returned by Nokogiri. Nokogiri converts HTML and XML documents in
+to a tree data structure.
+
+For example, an HTML document that looks like this:
+
+ <html>
+ <head>
+ <title>Hello!</title>
+ </head>
+ <body id="uniq">
+ <h1>Hello World!</h1>
+ </body>
+ </html>
+
+will be represented in memory with a tree that looks like this:
+
+![HTML Tree](html_tree.png)
+
## Data Extraction
### Basic XPath
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