>>> import albatross
>>> class Field:
...     def __init__(self, label, value):
...         self.label = label
...         self.value = value
... 
>>> ctx = albatross.SimpleContext('.')
>>> ctx.locals.name = Field('Name', 'Smith')
>>> ctx.locals.age  = Field('Age', 23)
>>> albatross.Template(ctx, '<magic>', '''
... <al-macro name="fieldlayout">
...  <al-value expr="label"> <al-input name="value" whitespace>
... </al-macro>
... ''').to_html(ctx)
>>> ctx.flush_content()
>>> albatross.Template(ctx, '<magic>', '''
... <al-expand name="fieldlayout" namespace="name" />
... <al-expand name="fieldlayout" namespace="age" />
... ''').to_html(ctx)
>>> ctx.flush_content()
Name <input name="name.value" value="Smith" />
Age <input name="age.value" value="23" />
