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Wrong error code given for Constr-pi-target-1 to -4. Expected error code is given in catalog as XPST0003. Should be XQDY0064.
"XML" as name for direct PI constructor is restricted through grammer: [105] DirPIConstructor ::= "<?" PITarget (S DirPIContents)? "?>" [152] PITarget ::= [http://www.w3.org/TR/REC-xml#NT-PITarget]XML which in turn excludes XML as valid PI target. There is no reference to XQDY0064 in section 3.7.2