>>> import albatross
>>> ctx = albatross.SimpleContext('.')
>>> class Field:
...     prompt = 'Enter age'
...     data = 23
...
>>> ctx.locals.field = Field()
>>> albatross.Template(ctx, '<magic>', '''
... <al-namespace name="field">
...  <al-value expr="prompt">: <al-input name="data" whitespace>
... </al-namespace>
... ''').to_html(ctx)
>>> ctx.flush_content()
Enter age: <input name="field.data" value="23" />
