2016 Update

Task/XML-XPath/Bracmat/xml-xpath.bracmat

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+{Retrieve the first "item" element}
+(   nestML$(get$("doc.xml",X,ML))
+  :   ?
+      ( inventory
+      . ?,? (section.?,? ((item.?):?item) ?) ?
+      )
+      ?
+& out$(toML$!item)
+)
+
+{Perform an action on each "price" element (print it out)}
+(   nestML$(get$("doc.xml",X,ML))
+  :   ?
+      ( inventory
+      .   ?
+        ,   ?
+            ( section
+            .   ?
+              ,   ?
+                  ( item
+                  .   ?
+                    ,   ?
+                        ( price
+                        .   ?
+                          ,   ?price
+                            & out$!price
+                            & ~
+                        )
+                        ?
+                  )
+                  ?
+            )
+            ?
+      )
+      ?
+|
+)
+
+{Get an array of all the "name" elements}
+(   :?anArray
+  &   nestML$(get$("doc.xml",X,ML))
+    :   ?
+        ( inventory
+        .   ?
+          ,   ?
+              ( section
+              .   ?
+                ,   ?
+                    ( item
+                    .   ?
+                      ,   ?
+                          ( name
+                          .   ?
+                            ,   ?name
+                              & !anArray !name:?anArray
+                              & ~
+                          )
+                          ?
+                    )
+                    ?
+              )
+              ?
+        )
+        ?
+| out$!anArray {Not truly an array, but a list.}
+);

Task/XML-XPath/PowerShell/xml-xpath-1.psh

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+$document = [xml]@'
+<inventory title="OmniCorp Store #45x10^3">
+  <section name="health">
+    <item upc="123456789" stock="12">
+      <name>Invisibility Cream</name>
+      <price>14.50</price>
+      <description>Makes you invisible</description>
+    </item>
+    <item upc="445322344" stock="18">
+      <name>Levitation Salve</name>
+      <price>23.99</price>
+      <description>Levitate yourself for up to 3 hours per application</description>
+    </item>
+  </section>
+  <section name="food">
+    <item upc="485672034" stock="653">
+      <name>Blork and Freen Instameal</name>
+      <price>4.95</price>
+      <description>A tasty meal in a tablet; just add water</description>
+    </item>
+    <item upc="132957764" stock="44">
+      <name>Grob winglets</name>
+      <price>3.56</price>
+      <description>Tender winglets of Grob. Just add water</description>
+    </item>
+  </section>
+</inventory>
+'@
+
+$query = "/inventory/section/item"
+$items = $document.SelectNodes($query)

Task/XML-XPath/PowerShell/xml-xpath-2.psh

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+$items[0]

Task/XML-XPath/PowerShell/xml-xpath-3.psh

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+$namesAndPrices = $items | Select-Object -Property name, price
+$namesAndPrices

Task/XML-XPath/PowerShell/xml-xpath-4.psh

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+$items.price

Task/XML-XPath/PowerShell/xml-xpath-5.psh

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+$items.name