Loading nested XML elements not working properly

Neo4j Graph Platform
1

I am trying to load a XML file with apoc and merge different nested elements into nodes. Unfortunately, in case there are nested elements, my query returns multiple elements per unique ID where I only want one. A different cypher query only returns a Type missmatch.

XML file:

<?xml version="1.0" encoding="UTF-8"?>
<document>
  <objects type="w">
    <spec>
      <id>some_id</id>
      <shortdesc>sd</shortdesc>
      <status>approved</status>
      <version>1</version>
      <sourcefile>source</sourcefile>
      <sourceline>1</sourceline>
      <description>description</description>
      <needs>
        <needso>f</needso>
      </needs>
      <provides>
        <provcov>
          <L2>some_random_number</L2>
          <dstv>1</dstv>
        </provcov>
        <provcov>
          <L2>some_random_number_1</L2>
          <dstv>1</dstv>
        </provcov>
      </provides>
    </spec>

My cypher query I:

call apoc.load.xml("file:/import.xml",'/document/objects',{}, false) yield value as ids
unwind ids._children as RA
unwind RA._children as RA2
unwind RA2._children as RA3
return ids.type as Type,
[item in RA3._children where item._type = 'L2'|item._text] as L2,
[item in RA._children where item._type = 'id'|item._text] as id

As you can see in the results, there two rows (nodes) for the same ID where I actually only want one. I know the unwind transforms the elements to rows, but otherwise I get an error (see cypher query 2 at the end for details).

Type L2 id
sw null [some_id]
sw [some_random_number] [some_id]

Any idea to have only one row (node) per parent (id)? Skipping the 'null' cells is not an option because there are some IDs which have a L2 'null' attribute.

Thank you in advance.

Cypher query 2:

call apoc.load.xml("file:/import.xml",'/document/objects,{}, true) yield value
unwind value as RA
unwind RA._objects as RA1
return RA.type as Type,
    [item in RA1._spec where item._type='id'|item._text] as ID,
    [item in RA1._spec._provides._provcov where item._type='L2'] as L2;

Result:

Type mismatch: expected a map but was List
2

Hi,

It's not really clear from your post which are your expected rows.

If the one not desired is the one with null as tag, you can try:

call apoc.load.xml("file:/t.xml",'/document/objects',{}, false) yield value as ids
unwind ids._children as RA
unwind RA._children as RA2
unwind RA2._children as RA3
with *
where any(item in RA3._children where item._type = 'L2')
return ids.type as Type,
[item in RA3._children where item._type = 'L2'|item._text] as L2,
[item in RA._children where item._type = 'id'|item._text] as id

Bennu

3

Thx for your reply. My expected result would look sth like this:

Type L2 id
sw null, [some_random_number, some_random_number_1, ...] [some_id]

Basically that all duplicated rows for the same ID are reduced and aggregated into one row so I can process them more consistent. Skipping the null rows per default is not an option because there are some elements that have no L2 entry.