Using XPath in Markup

Markup provides basic ​XPath support for matching and querying event streams.

Limitations

Due to the streaming nature of the processing model, Markup uses only a subset of the ​XPath 1.0 language.

In particular, only the following axes are supported:

• attribute
• child
• descendant
• descendant-or-self
• namespace (not completed yet)
• self

In addition, Markup does not (yet) support numeric types in XPath: everything is treated as text or booleans. For that reason, ​relational or ​additive operators such as >, <, or <=.

Querying Streams

from markup.input import XML

doc = XML('''<doc>
 <items count="2">
      <item status="new">
        <summary>Foo</summary>
      </item>
      <item status="closed">
        <summary>Bar</summary>
      </item>
  </items>
</doc>''')
print doc.select('items/item[@status="closed"]/summary/text()')

This would result in the following output:

Bar

Matching in Templates

See MarkupTemplates#py:match

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See also: MarkupGuide?, MarkupStream