Docs for SQLFORM._xml.im_class

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    SQLFORM is used to map a table (and a current record) into an HTML form
   
    given a SQLTable stored in db.table

    SQLFORM(db.table) generates an insert form
    record=db(db.table.id==some_id).select()[0]
    SQLFORM(db.table,record) generates an update form
    SQLFORM(db.table,record,deletable=True) generates an update 
                                            with a delete button
    
    optional arguments:
    
    fields: a list of fields that should be placed in the form, default is all.
    labels: a dictionary with labels for each field. keys are field names.
    col3  : a dictionary with content for an optional third column (right of each field). keys are field names.
    linkto: the URL of a controller/function to access referencedby records
            see controller appadmin.py for examples
    upload: the URL of a controller/function to download an uploaded file
            see controller appadmin.py for examples
    any named optional attribute is passed to the <form> tag
            for example _class, _id, _style, _action,_method, etc.