model.field().create(<tag>,<fname>) creates a field with tag <tag> with the field name <fname>.

 model.field(<tag>).field(<fname>) sets the field name.

  model.field(<tag>).shape(<shlist>) sets the shape functions defining the field variables. <shlist> is a list of shape function tags. Each shape function defines one or more field variables. Together the shape functions specify which field variables there are in the field.

 model.field(<tag>).field() returns the field name as a string.

 model.field(<tag>).shape() returns the shape function tags as a string array.

 model.field(<tag>).geom() returns the geometry associated with the field.

model.shape(), model.coeff()