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4 changes: 2 additions & 2 deletions Recommendations.md
Original file line number Diff line number Diff line change
Expand Up @@ -346,8 +346,8 @@ Pragmas

- **Dbxref**
- **This pragma is optional**
- **Format: ##dbxref=\<Namespace:ID,refsrc=URL\>**
- **Example: ##dbxref=ncbiprotein:CAA71118.1,refsrc= identifiers.org; (which resolves to** **[https://identifiers.org/ncbiprotein:CAA71118.](https://identifiers.org/ncbiprotein:CAA71118.1)[1](https://identifiers.org/ncbiprotein:CAA71118.1)****)**
- **Format: ##dbxref=\<Database:ID\>**
- **Example: ##dbxref=ncbiprotein:CAA71118.1 (which resolves to** **[https://identifiers.org/ncbiprotein:CAA71118.](https://identifiers.org/ncbiprotein:CAA71118.1)[1](https://identifiers.org/ncbiprotein:CAA71118.1)****)**
- **Addendum: This requires that the database providing the xref register at and obtain a namespace from Identifiers.org.**
- **Ontology URIs**
- In the current GFF3 specification, ontology URIs, for example ##feature-ontology URI, can be specified via cv URLs (e.g. http://song.cvs.sourceforge.net/*checkout*/song/ontology/sofa.obo?revision=1.6). These URLs should be avoided. Instead, we recommend using the official OBO version IRI PURLs, for example http://purl.obolibrary.org/obo/so.obo.
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