I'm trying to use XPath to find all elements that have an element in a given namespace.

For example, in the following document I want to find the `foo:bar` and `doodah` elements:

```
<?xml version="1.0" encoding="UTF-8"?>
<root xmlns:foo="http://foo.example.com">
  <foo:bar quux="value">Content</foo:bar>
  <widget>Content</widget>
  <doodah foo:quux="value">Content</doodah>
</root>

```

I know I can use the following XPath expression to load all attributes from a given namespace:

```
"//@*[namespace-uri()='http://foo.example.com']"

```

However:

* This doesn't give me the elements, just the attributes.
* Where elements contain multiple attributes from that namespace, this selector will return a result per-attribute rather than per-element

Is it possible to get what I want, or do I have to gather the attributes and calculate the unique set of elements they correspond to?