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Introduction to XPath

Introduction to XPath. Lech Rzedzicki , Kode1100 Ltd Stuart Moorhouse , DK. Traversing XML. XML can be traversed in 9 directions: self, child, parent, preceding-sibling, following-sibling, ancestor, descendant, preceding, following, You can combine/chain commands filter commands

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Introduction to XPath

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  1. Introduction to XPath Lech Rzedzicki , Kode1100 Ltd Stuart Moorhouse, DK

  2. Traversing XML • XML can be traversed in 9 directions: self, child, parent, preceding-sibling, following-sibling, ancestor, descendant, preceding, following, • You can combine/chain commands filter commands • Example: <A><B><C/></B><D/><E/><F><G><H/></G><I/><J><K/><L><M/><N/></L><O/><P/><Q><R/><S/></Q></J><T/><U><V/></U></F><W/><X/><Y><Z/></Y></A>

  3. Example in Xpath

  4. 7 types of Nodes on the tree • Document • Namespaces • Elements • Attributes • Comments • Processing-instructions • Text

  5. Namespaces • Namespaces are N°1 source of problems. • Remember about the default namespace. • Prefix is not a namespace: dita:book≠dita:book • Define the namespaces properly and then you can even use different prefix (but don’t).

  6. Shortcuts • // any descendant • . Current node • * all/any elements • @* all attributes

  7. Combine with RegExp • In OxygenXML Find/Replace window • In Xpath bar • //section[count(descendant::node())=0]/text() +regexp: .* would select the whole text of the lowest level sections in the document

  8. Exercise: sample-dk.xml //section[@metaref] distinct-values(//@metaref/tokenize(.,'\s+')) /book/part[1]/chapter[1]/section[1]/section[1]/section[1]/section[1]/section[2]/para[1]/address[2]/phrase[1] //ancestor::node()[substring-after(@rend,'level_LH')='2']

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