3.2 xi:fallback Element
xi:fallback Element
The xi:fallback element appears as a child
of an xi:include element. It provides a mechanism
for recovering from missing resources. When a
resource error is
encountered, the xi:include element is replaced
with the contents of the xi:fallback element.
If the xi:fallback element is empty, the
xi:include element is removed from the result.
If the xi:fallback element is missing, a
resource error results
in a fatal error.
The xi:fallback element can appear only as a
child of an xi:include element. It is a
fatal error for an xi:fallback
element to appear in a document anywhere other than as the direct child
of the xi:include (before inclusion processing on
the contents of the element.) It is a fatal error
for the xi:fallback element to contain any elements from the
XInclude namespace other than xi:include.
Attributes Must, May, etc.
be placed on the xi:fallback element. Unprefixed
attribute names are reserved for future versions of this specification,
and Must, May, etc. be ignored by XInclude 1.0
processors.
The following (non-normative) DTD fragment illustrates a sample
declaration for the xi:fallback element:
<!ELEMENT xi:fallback ANY>
<!ATTLIST xi:fallback
xmlns:xi CDATA #FIXED "http://www.w3.org/2001/XInclude"
>
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