Update DevelopmentGuidelines.md

Author: nataled

docs/DevelopmentGuidelines.md

@@ -21,3 +21,30 @@ title: Ontology Project Management Guidelines
 
 - Publications metadata [#1671](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/1671)
 - ***MORE DISCUSSION NEEDED*** Short ontology descriptions [#1968](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/1968)
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+THE FOLLOWING ARE FOR THE OTHER PAGE, KEPT HERE PENDING FINALIZATION
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+technical:
+- Standardizing how imported ontologies are noted [#424](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/424)
+- Ontology metadata requirements [#1365](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/1365)
+- ***MORE DISCUSSION NEEDED*** Language tags [#479](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/479)
+  - For rdfs:label and IAO:0000115 annotation assertions, we discourage the use of datatype declarations such as `xsd:string`. It is important to note that `xsd:string` is essentially redundant in OWL/RDF, so "assay" and "assay"^^xsd:string should be the exact same thing. However, a lot of tooling may be confused by the difference, xsd:string datatype assertion SHOULD be omitted in general for all annotations, but MUST be omitted for rdfs:label and IAO:0000115.
+  - To designate rdfs:label, and IAO:0000115 annotations in a language different from English, a [valid RDF language tag](https://www.w3.org/TR/rdf11-concepts/#section-Graph-Literal) MUST be specified, for example, "Krankheit"@de.
+  - rdfs:label and IAO:0000115 annotation assertions for English content MAY be annotated with an English language tag. If the ontology chooses not to use language tags, a protege:defaultLanguage assertion MUST be added as an ontology annotation.
+- Use standard synonym types [#2450](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/2450)
+- Modeling metaclasses [#2454](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/2454)
+- Ontology merging metadata [#1548](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/1548)
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+content:
+- Discourage BFO shadow classes [#1539](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/1539)
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