Dell DX6004S Setup And Configuration Manual - Page 13

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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

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 }

RELAX-NG Compact

Version 2.2

December 2010