Apparently in OPML 1.0 text attributes are not required, so this should make it work for all versions.  | 
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|---|---|---|
| .. | ||
| construction_1.opml | ||
| construction_2.opml | ||
| invalid_opml_no_outlines.opml | ||
| invalid_opml_version.opml | ||
| invalid_opml_version_1_0.opml | ||
| invalid_opml_version_1_1.opml | ||
| invalid_xml.opml | ||
| minimum_valid_opml.opml | ||
| valid_opml_1_0.opml | ||
| valid_opml_with_everything.opml | ||