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Jhove reports error for non-standard violating criterion (imbalanced page trees)
| Title |
Jhove error messages "Invalid page tree node" and "Improperly constructed page tree" are not file format errors according to the PDF 1.7 standard |
| Detailed description | Jhove reports an error for PDF files which contain imbalances page trees. The PDF 1.7 does not formulate balanced page trees as a requirement, but only gives information on this subject matter: "However, to optimize application performance, a conforming writer can construct trees of a particular form, known as balanced trees." (section 7.7.3) The jhove error messages leads to the objects being considered not well-formed. |
| Issue champion | [Michelle Lindlar |
| Other interested parties |
Any other parties who are also interested in applying Issue Solutions to their Datasets. |
| Possible Solution approaches | Brief brainstorm of possible approaches to solving the Issue. Each approach should be described in a single sentence as part of a bulleted list. Further detail can go in a dedicated Solution page. Solution A: the message should either be removed completley and the fact of imbalanced trees be integrated as an extracted technical metadata criterion Solution B: the message should be turned from an "error" into an "info" message. In either cases, it should not lead to the object being regarded not well-formed. |
| Context | As jhove is used by many digital preservation repositories, the correct reporting of errors is essential. |
| Lessons Learned | A central knowledge page linking jhove errors against standard information and testing them against actual standard violations would be beneficial. |
| Datasets | Reference to the appropriate Dataset page, by hyperlink. Note that all Issues MUST be linked to at least one Dataset! |
| Solutions | Reference to the appropriate Solution page(s), by hyperlink. |