Github user markap14 commented on a diff in the pull request:
    --- Diff: 
    @@ -0,0 +1,133 @@
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You under the Apache License, Version 2.0
    + * (the "License"); you may not use this file except in compliance with
    + * the License.  You may obtain a copy of the License at
    + *
    + *
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +package org.apache.nifi.xml;
    +import org.apache.nifi.annotation.documentation.CapabilityDescription;
    +import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.annotation.lifecycle.OnEnabled;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.controller.ConfigurationContext;
    +import org.apache.nifi.logging.ComponentLog;
    +import org.apache.nifi.processor.util.StandardValidators;
    +import org.apache.nifi.schema.access.SchemaNotFoundException;
    +import org.apache.nifi.serialization.DateTimeUtils;
    +import org.apache.nifi.serialization.MalformedRecordException;
    +import org.apache.nifi.serialization.RecordReader;
    +import org.apache.nifi.serialization.RecordReaderFactory;
    +import org.apache.nifi.serialization.SchemaRegistryService;
    +import org.apache.nifi.serialization.record.RecordSchema;
    +import java.util.ArrayList;
    +import java.util.List;
    +import java.util.Map;
    +@Tags({"xml", "record", "reader", "parser"})
    +@CapabilityDescription("Reads XML content and creates Record objects. 
Records are expected in the second level of " +
    +        "XML data, embedded in an enclosing root tag.")
    +public class XMLReader extends SchemaRegistryService implements 
RecordReaderFactory {
    +    public static final PropertyDescriptor VALIDATE_ROOT_TAG = new 
    +            .name("validate_root_tag")
    +            .displayName("Validate Root Tag")
    +            .description("If this property is set, the name of root tags 
(e. g. <root><record>...</record></root>) of incoming FlowFiles will be 
evaluated against this value. " +
    +                    "In the case of a mismatch, an exception is thrown. 
The treatment of such FlowFiles depends on the implementation " +
    +                    "of respective Processors.")
    +            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
    +            .expressionLanguageSupported(true)
    +            .required(false)
    +            .build();
    +    public static final PropertyDescriptor VALIDATE_RECORD_TAG = new 
    --- End diff --
    Likewise, I think we should remove this property and this sort of 
validation as well. If the user wants to validate some specific XML element 
names, the ValidateRecord processor is a great solution for that, and provides 
far more flexible validation via schema.


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