## net.sf.saxon.value
Class Cardinality

    java.lang.Object
      net.sf.saxon.value.Cardinality

public final class Cardinality
extends java.lang.Object

This class contains static methods to manipulate the cardinality property of a type. Cardinality of expressions is denoted by one of the values ONE_OR_MORE, ZERO_OR_MORE, ZERO_OR_ONE, EXACTLY_ONE, or EMPTY. These are combinations of the three bit-significant values ALLOWS_ZERO, ALLOWS_ONE, and ALLOWS_MANY.

Method Summary
`static int` `add(int c1, int c2)` Add two cardinalities
`static boolean` `allowsMany(int cardinality)` Determine whether multiple occurrences are allowed
`static boolean` `allowsZero(int cardinality)` Determine whether empty sequence is allowed
`static java.lang.String` `getOccurrenceIndicator(int cardinality)` Get the occurence indicator representing the cardinality
`static int` `multiply(int c1, int c2)` Multiply two cardinalities
`static boolean` `subsumes(int c1, int c2)` Test if one cardinality subsumes another.
`static int` `sum(int c1, int c2)` Form the sum of two cardinalities
`static java.lang.String` `toString(int cardinality)` Display the cardinality
`static int` `union(int c1, int c2)` Form the union of two cardinalities.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### allowsMany

    public static final boolean allowsMany(int cardinality)

  Determine whether multiple occurrences are allowed

### allowsZero

    public static final boolean allowsZero(int cardinality)

  Determine whether empty sequence is allowed

### union

    public static final int union(int c1,
                                  int c2)

  Form the union of two cardinalities. The cardinality of the expression "if (c) then e1 else e2" is the union of the cardinalities of e1 and e2.

  Parameters:
    `c1` - a cardinality
    `c2` - another cardinality
  Returns:
    the cardinality that allows both c1 and c2

### sum

    public static final int sum(int c1,
                                int c2)

  Form the sum of two cardinalities

### subsumes

    public static final boolean subsumes(int c1,
                                         int c2)

  Test if one cardinality subsumes another. Cardinality c1 subsumes c2 if every option permitted by c2 is also permitted by c1.

  Parameters:
    `c1` - a cardinality
    `c2` - another cardinality
  Returns:
    true if if every option permitted by c2 is also permitted by c1.

### add

    public static final int add(int c1,
                                int c2)

  Add two cardinalities

### multiply

    public static final int multiply(int c1,
                                     int c2)

  Multiply two cardinalities

### toString

    public static java.lang.String toString(int cardinality)

  Display the cardinality

### getOccurrenceIndicator

    public static java.lang.String getOccurrenceIndicator(int cardinality)

  Get the occurence indicator representing the cardinality