Sumbu XPath
Dokumen Contoh XML
Kami akan menggunakan dokumen XML berikut dalam contoh di bawah ini.
<?xml version="1.0" encoding="UTF-8"?>
<bookstore>
<book>
<title lang="en">Harry Potter</title>
<price>29.99</price>
</book>
<book>
<title lang="en">Learning XML</title>
<price>39.95</price>
</book>
</bookstore>
Sumbu XPath
Sumbu mewakili hubungan ke simpul konteks (saat ini), dan digunakan untuk menemukan simpul relatif terhadap simpul itu di pohon.
| AxisName | Result |
|---|---|
| ancestor | Selects all ancestors (parent, grandparent, etc.) of the current node |
| ancestor-or-self | Selects all ancestors (parent, grandparent, etc.) of the current node and the current node itself |
| attribute | Selects all attributes of the current node |
| child | Selects all children of the current node |
| descendant | Selects all descendants (children, grandchildren, etc.) of the current node |
| descendant-or-self | Selects all descendants (children, grandchildren, etc.) of the current node and the current node itself |
| following | Selects everything in the document after the closing tag of the current node |
| following-sibling | Selects all siblings after the current node |
| namespace | Selects all namespace nodes of the current node |
| parent | Selects the parent of the current node |
| preceding | Selects all nodes that appear before the current node in the document, except ancestors, attribute nodes and namespace nodes |
| preceding-sibling | Selects all siblings before the current node |
| self | Selects the current node |
Ekspresi Jalur Lokasi
Jalur lokasi bisa absolut atau relatif.
Jalur lokasi absolut dimulai dengan garis miring ( / ) dan jalur lokasi relatif tidak. Dalam kedua kasus, jalur lokasi terdiri dari satu atau lebih langkah, masing-masing dipisahkan oleh garis miring:
An absolute location path:
/step/step/...
A relative location path:
step/step/...
Setiap langkah dievaluasi terhadap node di node-set saat ini.
Sebuah langkah terdiri dari:
- sumbu (mendefinisikan hubungan pohon antara node yang dipilih dan node saat ini)
- sebuah node-test (mengidentifikasi sebuah node dalam sebuah sumbu)
- nol atau lebih predikat (untuk lebih menyempurnakan kumpulan simpul yang dipilih)
Sintaks untuk langkah lokasi adalah:
axisname::nodetest[predicate]
Contoh
| Example | Result |
|---|---|
| child::book | Selects all book nodes that are children of the current node |
| attribute::lang | Selects the lang attribute of the current node |
| child::* | Selects all element children of the current node |
| attribute::* | Selects all attributes of the current node |
| child::text() | Selects all text node children of the current node |
| child::node() | Selects all children of the current node |
| descendant::book | Selects all book descendants of the current node |
| ancestor::book | Selects all book ancestors of the current node |
| ancestor-or-self::book | Selects all book ancestors of the current node - and the current as well if it is a book node |
| child::*/child::price | Selects all price grandchildren of the current node |