fix usage of wrong flag for XML validation

CityDoctorParent/CityDoctorValidation/src/main/java/de/hft/stuttgart/citydoctor2/check/Checker.java

@@ -921,7 +921,7 @@ public class Checker {
             PdfStreamReporter pdfReporter = getPdfReporter(config, pdfBos, fileName);
             
             // XML validation
-			if (config.isUseStreaming() && (xmlReporter != null || pdfReporter != null)) {
+			if (config.isXmlValidation() && (xmlReporter != null || pdfReporter != null)) {
 				List<String> validationIssues = CityGmlParser.validateFile(null, inputFile.toPath());
 				for (String xmlError : validationIssues) {
 					XMLValidationError validationError = new XMLValidationError(xmlError);

CityDoctorParent/CityDoctorValidation/src/test/resources/testConfigWithStreamingWithValidation.yml

@@ -2,6 +2,7 @@ globalParameters:
    numberOfRoundingPlaces: 8
    schematronFilePath: src/test/resources/schematronTest.xml
 useStreaming: true
+xmlValidation: true
 requirements:
    R_GE_R_TOO_FEW_POINTS:
       enabled: true