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https://issues.apache.org/jira/browse/DIGESTER-143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12930594#action_12930594
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Simone Tripodi commented on DIGESTER-143:
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Can you provide please a use case? Thanks in advance!
> Unintuitive, possibly broken behaviour.
> ---------------------------------------
>
> Key: DIGESTER-143
> URL: https://issues.apache.org/jira/browse/DIGESTER-143
> Project: Commons Digester
> Issue Type: Improvement
> Affects Versions: 2.1
> Environment: Linux 64 bits
> Reporter: i30817
> Priority: Minor
>
> When one tag is a substring of another tag and both are used as xml patterns,
> such as:
> "rdf:RDF/pgterms:etext/dc:creator"
> "rdf:RDF/pgterms:etext/dc:creator/rdf:Bag/rdf:li" (instances in a collection
> of creators)
> the callback to the first is called once with empty strings ("") as the body
> of the tag if it encounters a instance of the second tag.
> If additionally the first tag has a argument
> "rdf:RDF/pgterms:etext/dc:creator rdf:type="Literal"" and you bind things
> correctly for a two arguments callback with the text body and the argument
> value ("Literal"), the callback of the first will be called with a null
> rdf:type argument and a empty string as the body. You can use this to
> distinguish the bogus callback as a workaround, but requires a additional
> bean method and confusing binding too.
> The best thing would be if these empty strings callback were avoidable. I can
> just test for empty string in the callback, however, i'm trying also to
> create assertions on the xml content (including, no empty strings).
> If the bogus callback must exist, one of the ways to make it obvious and
> distinguishable, would be to use null as the default value, instead of "". No
> xml document will have the computation null value, unless some very strange
> java binding is happening, in which case, you're asking for trouble. "" is
> even worse, because it is common to both domains.
> So RFE:
> 1) Avoid the bogus callback of the smaller xml tree branch if you can.
> 2) if you can't, use null as a default value instead of the indistinguishable
> "".
> 3) if 2) document this behavior in the javadoc and the digester FAQ.
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