The @when attribute cannot be used with any other att.datable.w3c attributes. The @from and @notBefore attributes cannot be used together. The @to and @notAfter attributes cannot be used together. When used on a schema description element (like ), the @source attribute should have only 1 value. (This one has .) The element should not be categorized in detail with @subtype unless also categorized in general with @type @targetLang should only be used on if @target is specified. The element indicated by @spanTo () must follow the current element @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. Information about a deprecation should only be present in a specification element that is being deprecated: that is, only an element that has a @validUntil attribute should have a child <desc type="deprecationInfo">. L'elemento date deve contenere esclusivamente un anno espresso con quattro cifre (ad esempio: 2018). The content of a "gloss" list should include a sequence of one or more pairs of a label element followed by an item element @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. Il contenuto di publisher deve essere "SISMEL. Edizioni del Galluzzo". Il contenuto di pubPlace deve essere "Firenze". Il valore di sponsor deve essere "SISMEL". @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. @calendar indicates one or more systems or calendars to which the date represented by the content of this element belongs, but this element has no textual content. Only one is allowed as a child of .