Processing error list

From atwg
 Has improper value for"Has improper value for" is a predefined property that tracks input errors for irregular value annotations and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.Processing error message"Processing error message" is a predefined property containing a textual description of an error and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
Prototype and test PHP implementation of ParsoidRisksProperty "Risks" (as page type) with input value "The prototype will be based on porting some limited pieces of Parsoid to judge how the port might perform. This limited prototyping is designed to give us a sense of whether to pick PHP, or use some other language so that the ported version is performant. However, the risk is that the final port might reveal factors we hadn't prototyped." contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process.