1. Session II Chapter 3 – Chapter 3 – XPath Patterns & Expressions Chapter 4 – XPath Functions Chapter 15 – XPath 2.0http://www.profburnett.com

2. Outline Introduction XPath 1.0 Nodes Syntax Nodes Relationship / Axes Operators XPath Functions XPath 2.0 8/1/2014Copyright © Carl M. Burnett2

3. Introduction XPath is a syntax for defining parts of an XML document XPath uses path expressions to navigate in XML documents XPath contains a library of standard functions XPath is a major element in XSLT XPath is a W3C recommendation 8/1/2014Copyright © Carl M. Burnett3

4. Introduction XPath Path Expressions Select nodes or node-sets XPath Standard Functions Over 100 built-in functions 8/1/2014Copyright © Carl M. Burnett4

5. Chapter 3 - XPath Nodes Seven Kinds of Nodes: Element Attribute Text Namespace Processing-instruction Comment Document 8/1/2014Copyright © Carl M. Burnett5

6. XPath Node Relationship / Axes Node Relationships / Axes: Node Relationships / Axes Parent Children Siblings Ancestors Descendants 8/1/2014Copyright © Carl M. Burnett6

7. XPath Operators 8/1/2014Copyright © Carl M. Burnett7

8. XPath Syntax Path ExpressionDescription nodenameSelects all nodes with the name "nodename" /Selects from the root node // Selects nodes in the document from the current node that match the selection no matter where they are.Selects the current node..Selects the parent of the current node @Selects attributes ExpressionDescription 8/1/2014Copyright © Carl M. Burnett8

9. Chapter 4 - XPath Functions Accessor Error and Trace Numeric String AnyURI Boolean Duration/Date/Time QName Node Sequence Context 8/1/2014Copyright © Carl M. Burnett9

10. Chapter 15 - XPath 2.0 XQuery/XPath Data Model (XDM) Supports XML Schemas XPath Sequences Comma Separated ordered lists of items. Defined by a node or atomic value. Can have duplicates Flat Structure Can Take Predicates - Filters [ ] Can be used in Loops 8/1/2014Copyright © Carl M. Burnett10

11. XPath 2.0 Processes Average Values Min – Max Formatting Strings Testing Conditions Quantifying a Condition Removing Duplicate Items Looping Over Sequences Using Date and Time Writing Comments Processing Non-XML Input 8/1/2014Copyright © Carl M. Burnett11

12. Review Introduction XPath 1.0 Nodes Syntax Nodes Relationship / Axes Operators XPath Functions XPath 2.0 8/1/2014Copyright © Carl M. Burnett12 Next - Chapters 12 & 13 XML Namespaces