Update StandardizationGuidelines.md

Author: nataled

docs/StandardizationGuidelines.md

@@ -13,12 +13,15 @@ title: Ontology Standardization Guidelines
 - 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)
 - Ontology root terms annotation [#2149](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/2149)
+  - In order to shield users from having to navigate through not-specific-enough parent terms (such as BFO:0000040 "material entity"), an ontology SHOULD specify one or more appropriate root terms
+  -   has ontology root term (IAO:0000700)
 - ***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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