Dell DX6000 Manual de instalación y configuración - Página 13

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Dell DX6000 Manual de instalación y configuración
clause. In the example above, where there are two publish clauses, all content streams can be
queued for remote replication once for each publish. In addition, when there are two select clauses
in a given publish clause, the content metadata is evaluated against each select clause's filter
set. The select clauses are evaluated in order from top to bottom. When the rules engine finds
a select whose filter clauses all evaluate to true, the content stream is placed in the appropriate
queue, (i.e. PrimaryDR or SecondaryDR), and awaits remote replication. Once the evaluation of that
publish clause is complete, the rules engine begins evaluation of the next publish clause. When all
publish clauses have been evaluated for a given content stream, then the Filter Rules Engine begins
evaluation for the next content stream.
3.1.2.2. Rules
The full syntax for the filter rules of a Publisher is presented in simplified
Syntax.
start = RuleSet
Exists and NotExists are tests to check if the header is present or not. An empty header will match
an exists query.
Filter expressions are built using a small set of functions. The set of functions available to a filter
are:
• matches(regexstr) or contains(regexstr) - matches any part of the header value to a given regular
expression
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All rights reserved
RuleSet = element rule-set {
Publish+
}
Publish = element publish {
Select+
}
Select = element select {
(Filter|Exists|NotExists)+,
attribute name { text }
}
Filter = element filter {
HeaderAttr,
# filter expression, using olderThan(), matches() etc.
text
}
Exists = element exists {
HeaderAttr
}
NotExists = element not-exists {
HeaderAttr
}
HeaderAttr = attribute header { text }
9
RELAX-NG Compact
Version 2.2
December 2010