constraint

• field
  The field to which the constraint must be applied.
  
• field2
  Another field the field is to be compared with.
  
• value
  The value the field is to be compared with.
  
• referid
  The value the field is to be compared.
  
• value2
  Needed for BETWEEN operator.
  
• referid2
  Needed for BETWEEN operator.
  
• inverse
  Inverses the constraint. So adds a NOT.
  
• casesensitive
  Changes the given constraint's `case sensitivity' (if applicable). Default it is false.
  
• part (since: MMBase-1.8)
  Designates a part of a date field to compare.
  

  CENTURY
  YEAR
  MONTH
  QUARTER
  WEEK
  DAY
  DAYOFYEAR
  DAYOFMONTH
  DAYOFWEEK
  HOUR
  MINUTE
  SECOND

• operator
  The operator to be used in the comparison. Defaults to `='
  

  EQUAL
  =
  LESS
  <
  LESS_EQUAL
  <=
  GREATER
  >
  GREATER_EQUAL
  >=
  LIKE
  BETWEEN	Should also use value2 or referid2
  IN	The value can be a comma separated String of values. You can also refer to some list with `referid' (e.g. to a nodelist tag)
  NULL	Tests whether the value of the field is NULL (or NOT NULL if inverse="true"). The `value' attributes are ignored.

• container

<mm:listnodescontainer type="people">
  <mm:composite operator="OR">
    <mm:constraint field="username" value="admin" operator="LIKE" />
    <mm:constraint field="username" value="test" operator="LIKE" />
  </mm:composite>
  <mm:listnodes>
    <mm:field name="username" /> <br />
  </mm:listnodes>
</mm:listnodescontainer>