Usage |
Enumerated type |
The usage property is used in conjunction with the Value property found in an attribute
object. The default for the Usage property
is optional. Select
from;
- optional.
- Where the Value property
is set to default and no data has been entered in the Value property,
the attribute can appear once and can have any value.
- Where the Value property
is set to default,
the attribute can appear once. If it does not appear, its value is the data
that has been entered in the Value property.
If it does appear it is the value given.
- Where the Value property
is set to fixed, the
attribute can appear once. If it does appear, its value must match the data
that has been entered in the Value property.
If it does not appear its value is the data that has been entered in the Value property.
- prohibited. The
attribute must not appear.
- required.
- Where the Value property
is set to default and
no data has been entered in the Value property,
the attribute must appear once and can have any value.
- Where the Value property
is set to fixed, the
attribute must appear once and it must match the data that has been entered
in the Value property.
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