Sequence with several increments

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  I would like to create a sequence number in oracle, but instead of coding hard 'start with' I want to choose the max value of the primary key of a table and add 1 and use it instead:
  
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  Hi all
  
  I get this error:
  
  ORA-19279: XQuery dynamic type mismatch: expected - singleton sequence got several sequence element
  
  When you try to select an XML type.
  
  The XML looks like:
  

  <users>
    <user>
      <username>123456</username>
      <details>
        <password>password</password>
        <forename>Barry</forename>
        <surname>Donovan</surname>
        <retired>0</retired>
        <email>email.com</email><phone>9999-88880333</phone>
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      <assignedRoles>
        <EXAM_CODE>9999_4949</EXAM_CODE>
        <EXAM_CODE>8888_3838</EXAM_CODE>
      </assignedRoles>
    </user>
  </users>

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  SELECT
         h.pin
        ,d.password
        ,d.forename
        ,d.surname
        ,d.email
        ,d.phone
        ,d2.exam_code
        FROM
           robin_temp x,
           xmltable('users/user' passing
              xml COLUMNS
                  pin       varchar2(1000) path 'username'
                , lineitem  xmltype        path 'details'
                , lineitem2 xmltype        path 'assignedRoles') h,
           XMLTable('details' PASSING
              h.lineitem COLUMNS
                 password varchar2(1000) path 'password'
                ,forename varchar2(1000) path 'forename'
                ,surname  varchar2(1000) path 'surname'
                ,email    varchar2(1000) path 'email'
                ,phone    varchar2(1000) path 'phone') d,
           xmltable('assignedRoles' passing
                h.lineitem2 columns
                exam_code varchar2(1000) path 'EXAM_CODE' d2                   

  Basically, because there is the child < details > and the < assignedRoles > child, I get this error. But I don't know what we can do about it...
  
  I'm still trying to sort this issue, but so far no joy at all... I can't imagine that it's a rare thing, then someone can help?
  
  Thank you so much in advance.
  
  Robin

  And multiple details, something like that...

  SQL> ed
  Wrote file afiedt.buf
  
    1  with t as (select xmltype('
    2    
    3      123456
    4      
  
    5        password
    6        Barry
    7        Donovan
    8        0
    9        email.com9999-88880333
   10      
   11      
   12        9999_4949
   13        8888_3838
   14      
   15    
   16  ') as xml from dual)
   17  --
   18  -- end of test data
   19  --
   20  select x.username
   21        ,y.password
   22        ,y.forename
   23        ,y.surname
   24        ,y.retired
   25        ,y.email
   26        ,z.exam_code
   27  from   t
   28        ,xmltable('/users/user'
   29                  passing t.xml
   30                  columns username      varchar2(20) path './username'
   31                         ,details       xmltype      path './details'
   32                         ,assignedroles xmltype      path './assignedRoles'
   33                 ) x
   34        ,xmltable('/details'
   35                  passing x.details
   36                  columns password      varchar2(20) path './password'
   37                         ,forename      varchar2(20) path './forename'
   38                         ,surname       varchar2(20) path './surname'
   39                         ,retired       number       path './retired'
   40                         ,email         varchar2(50) path './email'
   41                 ) y
   42        ,xmltable('/assignedRoles/EXAM_CODE'
   43                  passing x.assignedroles
   44                  columns exam_code     varchar2(20) path '.'
   45*                ) z
  SQL> /
  
  USERNAME             PASSWORD             FORENAME             SURNAME                 RETIRED EMAIL                                      EXAM_CODE
  -------------------- -------------------- -------------------- -------------------- ---------- -------------------------------------------------- --------------------
  123456               password             Barry                Donovan                       0 email.com                                          9999_4949
  123456               password             Barry                Donovan                       0 email.com                                          8888_3838
  
  SQL>
  

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