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wwelling / fcrepo-camel-toolbox

A collection of ready-to-use messaging applications with fcrepo-camel
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Solr indexing default transform not working for ldp:contains #5

Open wwelling opened 2 months ago

wwelling commented 2 months ago

What - description of what you me to do

Fix the SolrRouter to be able to select ldp:contains during XSLT.

Why - explain why this is important

This is important to resolve an inability of the XSLT of RDF+XML with the XSL is not able to select rdf:RDF/rdf:Description/ldp:contains/@rdf:resource.

codeautopilot[bot] commented 2 months ago

Potential solution

The plan to solve the bug is to ensure that the XSLT transformation is correctly selecting the ldp:contains property from the RDF+XML data. The reasoning behind this solution is based on the assumption that the XSLT file is correctly written and the namespaces are properly declared. The solution involves verifying the input data, testing the transformation, and potentially adding diagnostic output to the XSLT to troubleshoot the issue.

What is causing this bug?

The bug is likely caused by one of the following:

  1. The input RDF+XML data not containing ldp:contains elements where expected.
  2. The ldp:contains elements not having an rdf:resource attribute.
  3. A default namespace or another namespace conflict in the input data causing the selector to fail.

The XSLT selector appears to be correctly written, given that the namespaces are properly declared. Therefore, the issue may be with the input data or the environment in which the XSLT is executed.

Code

To troubleshoot the issue, the following diagnostic output can be added to the XSLT file:

<!-- Diagnostic output to log the input data -->
<xsl:template match="/">
  <xsl:copy-of select="."/>
</xsl:template>

<!-- Diagnostic output to log the results of the selection -->
<xsl:template match="rdf:RDF/rdf:Description">
  <xsl:copy-of select="ldp:contains/@rdf:resource"/>
</xsl:template>

This code will output the entire input data and the results of the ldp:contains selection, which can help identify where the transformation is failing.

How to replicate the bug

To replicate the bug, the following steps should be taken:

  1. Prepare an RDF+XML input data file that includes ldp:contains elements within rdf:Description elements.
  2. Run the XSLT transformation using the provided default_transform.xsl file.
  3. Observe whether the contains field in the Solr index contains the expected rdf:resource attribute values from the ldp:contains elements.

If the contains field is not populated as expected, the bug is replicated.

Click here to create a Pull Request with the proposed solution

Files used for this task:

Changes on fcrepo-indexing-solr/src/main/resources/org/fcrepo/camel/indexing/solr/default_transform.xsl The provided XSLT file is designed to transform RDF+XML data into a format suitable for indexing by Solr. The transformation is focused on extracting certain properties from the RDF data, such as the resource identifier, type, containment relationships, and timestamps for creation and last modification. The issue reported by the user indicates that the XSLT is not able to select the `ldp:contains` property correctly. This property is intended to represent containment relationships in Linked Data Platform (LDP) resources. Upon reviewing the source code of the XSLT file, the relevant line for the `ldp:contains` property is as follows: ```xml ``` This line is intended to extract the `rdf:resource` attribute of the `ldp:contains` element within the `rdf:Description` element of the RDF data. To address the issue, we need to ensure that the XSLT selector is correctly written and that the namespaces are properly declared and used. The namespaces are declared at the top of the XSLT file, and they appear to be correct: ```xml xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:ldp="http://www.w3.org/ns/ldp#" ``` Given that the namespaces are correctly declared, the selector should work as intended if the input RDF+XML data is correctly structured and the `ldp:contains` elements are present within the `rdf:Description` elements. However, if the user is still experiencing issues, it could be due to one of the following reasons: 1. The input RDF+XML data does not contain `ldp:contains` elements where expected. 2. The `ldp:contains` elements do not have an `rdf:resource` attribute. 3. There is a default namespace or another namespace conflict in the input data that is causing the selector to fail. To resolve the issue, the following steps could be taken: 1. Verify the input RDF+XML data to ensure that it contains `ldp:contains` elements with the `rdf:resource` attribute within `rdf:Description` elements. 2. If the input data is correct, test the XSLT transformation with a sample of the input data to see if the `ldp:contains` property is being selected as expected. 3. If the issue persists, consider adding diagnostic output to the XSLT to log the input data and the results of the selection to help identify where the transformation is failing. If the issue is not with the XSLT itself but with the input data or the environment in which the XSLT is being executed, the problem may lie outside the scope of this file, and further investigation would be needed in other parts of the system.