Usage |
Enumerated type |
Use this property with the Value property found in an attribute
object. The default value for the Usage property
is optional. Select
from the following options:
- optional.
- If 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.
- If 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.
- If 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.
- If 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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