text: """Module to implement something."""
  
  from typing import Optional
  
  from .expansions import ExpansionFailedError
  from .uritemplate import ExpansionInvalidError, ExpansionReservedError, URITemplate
  from .variable import Variable, VariableInvalidError
  
  
  __all__ = [
      'URITemplate', 'Variable',
      'ExpansionInvalidError', 'ExpansionReservedError', 'VariableInvalidError', 'ExpansionFailedError',
  ]
  
  
  def expand(template: str, **kwargs) -> Optional[str]:
      try:
          templ = URITemplate(template)
          return templ.expand(**kwargs)
      except Exception:
          return None
  
  
  def partial(template: str, **kwargs) -> Optional[str]:
      try:
          templ = URITemplate(template)
          return str(templ.partial(**kwargs))
      except Exception:
          return None
  
  
  def validate(template: str) -> bool:
      try:
          URITemplate(template)
          return True
      except Exception:
          return False
  