RFR: 8249867: xml declaration is not followed by a newline

[Joe Wang]

On Tue, 12 Jan 2021 21:25:54 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> Please review a patch to add an explicit control over whether a newline should be added after the XML header. This is done by adding a DOM LSSerializer property "jdk-is-standalone" and System property "jdk.xml.isStandalone". 
>> 
>> This change addresses an incompatibility introduced during 7u4 as an update to Xalan 2.7.1.
>
> When setting the fDOMConfigProperties is the difference between simple values of "yes" and "no" and the values of DOMConstants.DOM3_EXPLICIT_TRUE/FALSE significant?

The DOMConfigProperties differentiate "Explicit" values from the default ones. DOM3_EXPLICIT_TRUE/FALSE has a string form: explicit:yes/explicit:no, while the default ones default:yes/default:no. In some cases (for some parameters), default values are handled differently from the explicit ones. 

In this case, it's not significant for the new property as to how it was processed. I merely followed the existing practice and mechanism to align with the existing parameters.

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PR: https://git.openjdk.java.net/jdk/pull/2041