[MacPorts] #28393: Improvement to 'make validate'

[MacPorts]

#28393: Improvement to 'make validate'
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 Reporter:  l2g@…             |       Owner:  markd@…           
     Type:  enhancement       |      Status:  new               
 Priority:  Normal            |   Milestone:                    
Component:  guide             |     Version:                    
 Keywords:  haspatch          |        Port:                    
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 I discovered that by using `--postvalid` instead of `--valid` when calling
 `xmllint`, the guide can be validated in one step instead of two, and as
 an added benefit, validation errors will refer directly to the offending
 sources instead of "guide.tmp.xml".

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Ticket URL: <https://trac.macports.org/ticket/28393>
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