Examples of net.sf.saxon.value.Value.itemAt()

net.sf.saxon.value.Value.itemAt()
Get the n'th item in the sequence (starting from 0). This is defined for all Values, but its real benefits come for a sequence Value stored extensionally (or for a MemoClosure, once all the values have been read) @param n position of the required item, counting from zero. @return the n'th item in the sequence, where the first item in the sequence isnumbered zero. If n is negative or >= the length of the sequence, returns null.

                if (found > 1) {
                     typeError(
                        "A sequence of more than one item is not allowed as the " +
                        role.getMessage(), role.getErrorCode(), context);
                }
                result = value.itemAt(0);
            }
        }
        if (found == 0 && !allowEmpty) {
            typeError("An empty sequence is not allowed as the " +
                             role.getMessage(), role.getErrorCode(), null);

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                if (found > 1) {
                     typeError(
                        "A sequence of more than one item is not allowed as the " +
                        role.getMessage(), role.getErrorCode(), context);
                }
                result = value.itemAt(0);
            }
        }
        if (found == 0 && !allowEmpty) {
            typeError("An empty sequence is not allowed as the " +
                             role.getMessage(), role.getErrorCode(), null);

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                count += length;
                if (count > 1) {
                    return false;
                }
                if (length != 0) {
                    AtomicValue av = (AtomicValue)atomizedValue.itemAt(0);
                    if (!isCastable(av, targetType, context)) {
                        return false;
                    }
                }
            } else {

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