PREHOOK: query: DESCRIBE FUNCTION xpath_string
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION xpath_string
POSTHOOK: type: DESCFUNCTION
xpath_string(xml, xpath) - Returns the text contents of the first xml node that matches the xpath expression
PREHOOK: query: DESCRIBE FUNCTION EXTENDED xpath_string
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION EXTENDED xpath_string
POSTHOOK: type: DESCFUNCTION
xpath_string(xml, xpath) - Returns the text contents of the first xml node that matches the xpath expression
Example:
  > SELECT xpath_string('<a><b>b</b><c>cc</c></a>','a/c') FROM src LIMIT 1;
  'cc'
  > SELECT xpath_string('<a><b>b1</b><b>b2</b></a>','a/b') FROM src LIMIT 1;
  'b1'
  > SELECT xpath_string('<a><b>b1</b><b>b2</b></a>','a/b[2]') FROM src LIMIT 1;
  'b2'
  > SELECT xpath_string('<a><b>b1</b><b>b2</b></a>','a') FROM src LIMIT 1;
  'b1b2'
PREHOOK: query: SELECT xpath_string ('<a><b>bb</b><c>cc</c></a>', 'a') FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT xpath_string ('<a><b>bb</b><c>cc</c></a>', 'a') FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
bbcc
PREHOOK: query: SELECT xpath_string ('<a><b>bb</b><c>cc</c></a>', 'a/b') FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT xpath_string ('<a><b>bb</b><c>cc</c></a>', 'a/b') FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
bb
PREHOOK: query: SELECT xpath_string ('<a><b>bb</b><c>cc</c></a>', 'a/c') FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT xpath_string ('<a><b>bb</b><c>cc</c></a>', 'a/c') FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
cc
PREHOOK: query: SELECT xpath_string ('<a><b>bb</b><c>cc</c></a>', 'a/d') FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT xpath_string ('<a><b>bb</b><c>cc</c></a>', 'a/d') FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####

PREHOOK: query: SELECT xpath_string ('<a><b>b1</b><b>b2</b></a>', '//b') FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT xpath_string ('<a><b>b1</b><b>b2</b></a>', '//b') FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
b1
PREHOOK: query: SELECT xpath_string ('<a><b>b1</b><b>b2</b></a>', 'a/b[1]') FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT xpath_string ('<a><b>b1</b><b>b2</b></a>', 'a/b[1]') FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
b1
PREHOOK: query: SELECT xpath_string ('<a><b>b1</b><b>b2</b></a>', 'a/b[2]') FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT xpath_string ('<a><b>b1</b><b>b2</b></a>', 'a/b[2]') FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
b2
PREHOOK: query: SELECT xpath_string ('<a><b>b1</b><b id="b_2">b2</b></a>', 'a/b[@id="b_2"]') FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT xpath_string ('<a><b>b1</b><b id="b_2">b2</b></a>', 'a/b[@id="b_2"]') FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
b2