Proposal for p:split-sequence

p:head and p:tail as they stand cannot help doing that efficiently

<p:declare-step type="p:split-sequence">
     <p:input port="source" sequence="yes"/>
     <p:output port="result" sequence="yes"/>
     <p:output port="secondary" sequence="yes"/>
     <p:option name="test" required="yes"/>
</p:declare-step>

output to the !result until $test is false, then it will output the
rest of the sequence to !secondary

Mohamed,

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