The @generatedBy attribute is for use within a <post> element. 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 Abstract model violation: Paragraphs may not occur inside other paragraphs or ab elements. Abstract model violation: Metrical lines may not contain higher-level structural elements such as div, p, or ab, unless p is a child of figure or note, or is a descendant of floatingText.