1 XPATH Modified Slides from Dr. Sagiv. 2 XPath A Language for Locating Nodes in XML Documents XPath expressions are written in a syntax that resembles.

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Presentation transcript:

1 XPATH Modified Slides from Dr. Sagiv

2 XPath A Language for Locating Nodes in XML Documents XPath expressions are written in a syntax that resembles paths in file systems The list of nodes located by an XPath expression is called a Nodelist XPath is used in XSL and in XQuery (a query language for XML) W3Schools has an XPath tutorialXPath tutorial XPath includes –Axis navigation –Conditions –Functions

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

5 The Main Idea in the Syntax of XPath Expressoins “/” 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 relationship 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? 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 marks attributes 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 Relative Navigation Using Axes Starts with the current node and not with the root (/) A. marks the current node (e.g.,./title) A.. marks the parent node (e.g., title/../*) There are also other axes, e.g., child, descendent, ancestor, parent, following- sibling, etc.

17 Functions Many functions that are included in XPath Some examples: –count() – returns the number of nodes in a nodelist –last() – returns the last node in a nodelist –name() – returns the name of a node –position() – returns the position of the node in the nodelist

18 Additional Examples of XPath Expressions These examples use element names that are not necessarily from the XML document that was shown previously

19 Examples of XPath Expressions para –Selects the para children elements of the context node * –Selects all element children of the context node text() –Selects all text node children of the context –Selects the name attribute of the context node

20 More Examples of XPath –Selects all the attributes of the context node para[1] –Selects the first para child of the context node para[last()] –Selects the last para child of the context node */para –Selects all para grandchilren of the context node

21 More Examples of XPath Expressions /doc/chapter[5]/section[2] –Selects the second section of the fifth chapter of the doc chapter//para –Selects the para element descendants of the chapter element children of the context node //para –Selects all the para descendants of the document root and thus selects all para elements in the same document as the context node

22 More Examples of XPath Expressions //olist/item –Selects all the item elements that have an olist parent and are in the same document as the context node. –Selects the context node.//para –Selects the para descendants of the context node.. –Selects the parent of the context node

23 More Examples of XPath –Selects the lang attribute of the parent of the context node –Selects the para children of the context node that have a type attribute with value warning chapter[title] –Selects the chapter children of the context node that have one or more title children

24 More Examples of XPath Expressions –Selects the fifth para child among the children of the context node that have a type attribute with value warning –Selects the fifth para child of the context node if that child has a type attribute with value warning

25 More Examples of XPath Expressions chapter[title=“Introduction”] –Selects the chapter children of the context node that have one or more title children with string-value equal to Introduction –Selects employee children of the context node that have both a secretary attribute and an assistant attribute

26 More Examples of Xpath Expressions /university/department/course –This Xpath expression matches any path that starts at the root, which is a university element, passes through a department element and ends in a course –This Xpath expression matches any path that starts at the current element, continues to a child which is a department element and ends at a course element with a year attribute that is equal to 2002

27 Location Paths The previous examples are abbreviations of location paths –See XPath tutorial in W3Schools XPath tutorial –For example, // is short for /descendant-or-self::node()/. //para is short for /descendant-or-self::node()/child::para