What are XPath predicates and how do I use them?

What are XPath predicates and how do I use them?

XPath predicates are used to filter nodes in an XML document. They are enclosed in square brackets and can specify conditions.

Can you give me an example of an XPath predicate?

Sure! For instance, to select all <book> elements with a price less than 30, you would use: /catalog/book[price<30].

How do I combine multiple predicates?

You can combine predicates using 'and' or 'or'. For example: /catalog/book[price<30 and author='John Doe'] selects books by John Doe under $30.

Are there any common mistakes to avoid with XPath predicates?

Yes, a common mistake is forgetting to use the correct syntax for conditions or not properly closing brackets.