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https://issues.apache.org/jira/browse/JCR-325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13619922#comment-13619922
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Lukas Eder commented on JCR-325:
--------------------------------
I just came across this issue "by accident", as I was missing this feature
myself. I personally feel that this is an important missing feature in
Jackrabbit, as the document view export occupies much less space than the
system view export. Without exporting multi-valued properties, however, it
isn't really useful, except maybe for debugging.
How about this rule-set:
1. Multi-valued properties are serialised as originally requested, with a
whitespace character (ASCII 0x20) as a separator as specified by w3c's
<xsd:list/> type.
2. Whitespace characters contained in multi-valued properties are disambiguated
according to the most appropriate scheme in JCR, e.g. by putting _x0020_ (or
any more reliable scheme)
3. Nodes containing multi-value properties are "annotated" using an additional
attribute specified by a dedicated dv namespace (similar to
sv="http://www.jcp.org/jcr/sv/1.0"; namespace). dv stands for document view.
Example:
<banana jcr:primaryType="nt:unstructured"
multi="A B C_x0020_D"
multi2="1 2 3"
nonMulti="X Y Z"
dv:multiValue="multi multi2"
/>
In this example, "multi" and "multi2" are multi-valued properties:
- multi = ["A", "B", "C D"]
- multi2 = [1, 2, 3]
Whereas "nonMulti" is a single-valued property:
- nonMulti = "X Y Z"
"dv:multiValue" itself is a multi-valued pseudo-property, which isn't contained
in the repository, but is used for export / import only.
Note that adding such an additional namespace might allow exporting more than
just the multiValue property in the document view. For example, "protected",
"mandatory", "auto-created" flags could be exported as well, or the property
type "dv:type", which is redundant with "dv:multiValue", of course.
> docview roundtripping does not work with multivalue non-string properties
> -------------------------------------------------------------------------
>
> Key: JCR-325
> URL: https://issues.apache.org/jira/browse/JCR-325
> Project: Jackrabbit Content Repository
> Issue Type: Improvement
> Components: xml
> Affects Versions: 0.9, 1.0
> Environment: jackrabbit r379292
> Reporter: Tobias Bocanegra
> Assignee: Jukka Zitting
> Attachments: namespace-context.patch, xml-refactoring.patch
>
>
> when exporting a multivalue property with docview, the property values are
> serialized to a space delimited list in the xml attributes:
> for example:
> <?xml version="1.0" encoding="UTF-8"?>
> .
> .
> <testNode
> jcr:primaryType="refTest"
> refs="b5c12524-5446-4c1a-b024-77f623680271
> 7b4d4e6f-9515-47d8-a77c-b4beeaf469bc"
> />
> the refTest nodetype was:
> [refTest]
> - refs (reference) multiple
> importing this docview fails with: javax.jcr.ValueFormatException: not a
> valid UUID format
> this is due to the fact, that the space delimited list is not exploded
> anymore. actually this code is commented:
> org.apache.jackrabbit.core.xml.DocViewImportHandler, lines 191 - 200:
> /*
> // @todo should attribute value be interpreted as LIST type
> (i.e. multi-valued property)?
> String[] strings = Text.explode(attrValue, ' ', true);
> propValues = new Value[strings.length];
> for (int j = 0; j < strings.length; j++) {
> // decode encoded blanks in value
> strings[j] = Text.replace(strings[j], "_x0020_", " ");
> propValues[j] = InternalValue.create(strings[j]);
> }
> */
> i haven't tested, but i assume this also fails for all other non-string
> property types.
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