- Add supported `Element.xpath()` keywords to `validate.xml_xpath()`
  - `namespaces` for defining prefix-namespace mappings
  - `extensions` for defining custom XPath functions in Python
  - `smart_strings` for disabling element tree references on any string
     return values that will be kept in memory
  - `**variables` for being able to define custom XPath variables
    instead of having to embed strings in the XPath query itself
- Add `namespaces`, `extensions` and `**variables` keywords to
  `validate.xml_xpath_string()` and always disable `smart_strings`
- Add `namespaces` to `validate.xml_find()`, `validate.xml_findall()`
  and `validate.xml_findtext()`
- Handle XPath evaluation errors via `lxml.etree.XPathError`
  and ElementPath syntax errors via `SyntaxError`
- Update error messages of ElementPath-based validators
- Remove unneeded `iselement` validation at the end of `xml_find()`
- Fix docstrings of both XPath- and ElementPath-based validators
- Add tests for the newly added keywords and XPath evaluation errors

- Add supported `Element.xpath()` keywords to `validate.xml_xpath()`
  - `namespaces` for defining prefix-namespace mappings
  - `extensions` for defining custom XPath functions in Python
  - `smart_strings` for disabling element tree references on any string
     return values that will be kept in memory
  - `**variables` for being able to define custom XPath variables
    instead of having to embed strings in the XPath query itself
- Add `namespaces`, `extensions` and `**variables` keywords to
  `validate.xml_xpath_string()` and always disable `smart_strings`
- Add `namespaces` to `validate.xml_find()`, `validate.xml_findall()`
  and `validate.xml_findtext()`
- Handle XPath evaluation errors via `lxml.etree.XPathError`
  and ElementPath syntax errors via `SyntaxError`
- Update error messages of ElementPath-based validators
- Remove unneeded `iselement` validation at the end of `xml_find()`
- Fix docstrings of both XPath- and ElementPath-based validators
- Add tests for the newly added keywords and XPath evaluation errors

- Add supported `Element.xpath()` keywords to `validate.xml_xpath()`
  - `namespaces` for defining prefix-namespace mappings
  - `extensions` for defining custom XPath functions in Python
  - `smart_strings` for disabling element tree references on any string
     return values that will be kept in memory
  - `**variables` for being able to define custom XPath variables
    instead of having to embed strings in the XPath query itself
- Add `namespaces`, `extensions` and `**variables` keywords to
  `validate.xml_xpath_string()` and always disable `smart_strings`
- Add `namespaces` to `validate.xml_find()`, `validate.xml_findall()`
  and `validate.xml_findtext()`
- Handle XPath evaluation errors via `lxml.etree.XPathError`
  and ElementPath syntax errors via `SyntaxError`
- Update error messages of ElementPath-based validators
- Remove unneeded `iselement` validation at the end of `xml_find()`
- Fix docstrings of both XPath- and ElementPath-based validators
- Add tests for the newly added keywords and XPath evaluation errors

- Add supported `Element.xpath()` keywords to `validate.xml_xpath()`
  - `namespaces` for defining prefix-namespace mappings
  - `extensions` for defining custom XPath functions in Python
  - `smart_strings` for disabling element tree references on any string
     return values that will be kept in memory
  - `**variables` for being able to define custom XPath variables
    instead of having to embed strings in the XPath query itself
- Add `namespaces`, `extensions` and `**variables` keywords to
  `validate.xml_xpath_string()` and always disable `smart_strings`
- Add `namespaces` to `validate.xml_find()`, `validate.xml_findall()`
  and `validate.xml_findtext()`
- Handle XPath evaluation errors via `lxml.etree.XPathError`
  and ElementPath syntax errors via `SyntaxError`
- Update error messages of ElementPath-based validators
- Remove unneeded `iselement` validation at the end of `xml_find()`
- Fix docstrings of both XPath- and ElementPath-based validators
- Add tests for the newly added keywords and XPath evaluation errors