@Override
    public void startProcessing() {
        try {
            if (!addedSchemaFilter) {
                addedSchemaFilter = true;
                addTarget(getSchemaFilter());
            }
        } finally {
            super.startProcessing();
        }
    }
An XML filter for performing inline schema validation of XML.
stroom-pipeline/src/main/java/stroom/pipeline/filter/SchemaFilterSplit.java