Dear MODS community, I gathered and labelled some warnings and considerations from our MODS implementation AUTHORITHY and AUTHORITYURI I got the following validation errors on my MODS documents. Theoretically, if I include an authority I should have always the opportunity to include the authority's URI information. Here are listed the elements where we got warnings: Warning: DOMDocument::schemaValidate() [domdocument.schemavalidate]: Element '{http://www.loc.gov/mods/v3}physicalLocation', attribute 'authorithyURI': The attribute 'authorithyURI' is not allowed. Warning: DOMDocument::schemaValidate() [domdocument.schemavalidate]: Element '{http://www.loc.gov/mods/v3}recordContentSource', attribute 'authorithyURI': The attribute 'authorithyURI' is not allowed. Warning: DOMDocument::schemaValidate() [domdocument.schemavalidate]: Element '{http://www.loc.gov/mods/v3}recordContentSource', attribute 'authorithyURI': The attribute 'authorithyURI' is not allowed. For example in mods:phisicalLocation and in mods:recordContentSource the authorithyURI attribute is not validated by schema even though in the MODS documentation website it is declared ================================================================ RELATEDITEM I have internally mods:relatedItem a titleInfo/partNumber it seems that the schema doesn't validate this, even though in documentation is declared that "All MODS elements can appear as subelements", maybe sub-subelements are not allowed? ================================================================ TYPE OF RESOURCE The typeOfResource element doesn't allow the attribute "lang" useful for multilingualism, considering the large adoption of this element because is a mandatory element from DLF guidelines, maybe can be useful to add this attribute. Ex. <mods:typeOfResource lang="eng">still image</mods:typeOfResource> <mods:typeOfResource lang="ita">immagine fissa</mods:typeOfResource>