Output Requirements
SERXMLBC writes an XML reply message to DD statement XMLOUT. Requirements for output include:
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The output file is a sequential data set, PDS member, or PDSE member. 
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The following DCB parameters are set internally by SERXMLBC: RECFM=VB LRECL=5000
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Reply messages are formatted with one tag per record. 
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Tag indenting in reply messages expresses tag hierarchy.