1 XPath Extracting Data from XML. 2 Data stored in an XML document must be extracted to use with various applications Data can be extracted programmatically.

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Presentation transcript:

1 XPath Extracting Data from XML

2 Data stored in an XML document must be extracted to use with various applications Data can be extracted programmatically We will discuss XPath: a declarative language for extracting data from XML XPath is used extensively in other specifications, e.g., XQuery, XSL, XPointer

3 Dark Side of the Moon Pink Floyd Space Oddity David Bowie 9.90 Aretha: Lady Soul Aretha Franklin 9.90 Dark Side of the Moon Pink Floyd Space Oddity David Bowie 9.90 Aretha: Lady Soul Aretha Franklin 9.90 An XML document

4 catalog.xml catalog cd country titleartistprice titleartistpricetitleartistprice country UK USA Dark Side of the Moon Space OddityAretha: Lady Soul Pink Floyd David BowieAretha Franklin The XML document as a DOM tree The XML document as a DOM tree

5 Main Element of Syntax: Path Expressions / at the beginning of an XPath expression represents the root of the document / between element names represents a parent-child relationship // represents an ancestor-descendent marks an attribute [condition] specifies a condition

6 catalog.xml catalog cd country titleartistprice titleartistpricetitleartistprice country UK Dark Side of the Moon Space OddityAretha: Lady Soul Pink Floyd David BowieAretha Franklin /catalog Getting the root element of the document USA

7 catalog.xml catalog cd country titleartistprice titleartistpricetitleartistprice country UK Dark Side of the Moon Space OddityAretha: Lady Soul Pink Floyd David BowieAretha Franklin /catalog/cd Finding child nodes USA

8 catalog.xml catalog cd country titleartistprice titleartistpricetitleartistprice country UK Dark Side of the Moon Space OddityAretha: Lady Soul Pink Floyd David BowieAretha Franklin /catalog/cd/price Finding descendent nodes USA

9 catalog.xml catalog cd country titleartistprice titleartistpricetitleartistprice country UK Dark Side of the Moon Space OddityAretha: Lady Soul Pink Floyd David BowieAretha Franklin /catalog/cd[price<10] Condition on elements USA

10 catalog.xml catalog cd country titleartistprice titleartistpricetitleartistprice country UK Dark Side of the Moon Space OddityAretha: Lady Soul Pink Floyd David BowieAretha Franklin //title // represents any directed path in the document /catalog//title USA

11 catalog.xml catalog cd country titleartistprice titleartistpricetitleartistprice country UK Dark Side of the Moon Space OddityAretha: Lady Soul Pink Floyd David BowieAretha Franklin /catalog/cd/* * represents any element name in the document USA

12 catalog.xml catalog cd country titleartistprice titleartistpricetitleartistprice country UK Dark Side of the Moon Space OddityAretha: Lady Soul Pink Floyd David BowieAretha Franklin /*/* What will the following expressions return? //* //*[price=9.90] //*[price=9.90]/* USA * represents any element name in the document

13 catalog.xml catalog cd country titleartistprice titleartistpricetitleartistprice country UK Dark Side of the Moon Space OddityAretha: Lady Soul Pink Floyd David BowieAretha Franklin /catalog/cd[1] Position based condition /catalog/cd[last()] USA

14 catalog.xml catalog cd country titleartistprice titleartistpricetitleartistprice country UK Dark Side of the Moon Space OddityAretha: Lady Soul Pink Floyd David BowieAretha Franklin //title | //price Use | for union USA

15 catalog.xml catalog cd country titleartistprice titleartistpricetitleartistprice country UK Dark Side of the Moon Space OddityAretha: Lady Soul Pink Floyd David BowieAretha Franklin marks attributes USA

16 catalog.xml catalog cd country titleartistprice titleartistpricetitleartistprice country UK Dark Side of the Moon Space OddityAretha: Lady Soul Pink Floyd David BowieAretha Franklin marks attributes USA

17 catalog.xml catalog cd country titleartistprice titleartisttitleartistprice country UK Dark Side of the Moon Space OddityAretha: Lady Soul Pink Floyd David BowieAretha Franklin USA price How would you write: The price of the cds Whose artist is David Bowie?

18 XPath Axises We have discussed the following axises:  Child (/)  Descendent (//)  Attribute These symbols are actually a shorthand, e.g., /cd//price is the same as child::cd/descendent::price There are additional shorthands, e.g.,  Self (/.)  Parent (/..)

19 Additional Axises ancestorContains all ancestors (parent, grandparent, etc.) of the current node ancestor-or-selfContains the current node plus all its ancestors (parent, grandparent, etc.) descendant-or-selfContains the current node plus all its descendants (children, grandchildren, etc.) followingContains everything in the document after the closing tag of the current node following-siblingContains all siblings after the current node precedingContains everything in the document that is before the starting tag of the current node preceding-siblingContains all siblings before the current node

20 More Details XPath specification at W3C XPath XPath tutorial in W3Schools XPath tutorial Mulberry XPath Quick ReferenceQuick Reference