如何确保hive忽略dtd？
以下在hive中工作：

select xpath_string('<a><b>bb</b><c>cc</c></a>', 'a/b') from src limit 1;

但此查询没有（添加了dtd）：

select xpath_string('<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Archiving and Interchange DTD v1.0 20120330//EN" "JATS-archivearticle1.dtd"><a><b>bb</b><c>cc</c></a>', 'a/b') from src limit 1;

出现以下错误时失败：

Error occurred executing hive query: Error while compiling statement: FAILED: SemanticException [Error 10014]: Line 1:7 Wrong arguments ''a/b'': org.apache.hadoop.hive.ql.metadata.HiveException: Unable to execute method public org.apache.hadoop.io.Text org.apache.hadoop.hive.ql.udf.xml.UDFXPathString.evaluate(java.lang.String,java.lang.String) on object org.apache.hadoop.hive.ql.udf.xml.UDFXPathString@70b25313 of class org.apache.hadoop.hive.ql.udf.xml.UDFXPathString with arguments {<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Archiving and Interchange DTD v1.0 20120330//EN" "JATS-archivearticle1.dtd"><a><b>bb</b><c>cc</c></a>:java.lang.String, a/b:java.lang.String} of size 2