Should be a positive integer; if no value is provided,
the length is unlimited and goes to the next delimiter or to the
end of the value.
註
When constructing a reference, if the reference component
found is of numeric type, the length
is made up by inserting leading zeros; if it is not, by inserting
trailing blanks. In either case, reference components are truncated
if necessary at the right hand side.
When seeking a reference, the length indicates the
number of characters which should be compared. Values longer than
this will be regarded as matching, if they start correctly.
delim
(delimiter) supplies a delimiting string following the reference
component.
狀態
非必備的
資料類型
<rng:text/>
text
值
If a single space is used it is interpreted as
whitespace.