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 .) @targetLang should only be used on <> if @target is specified. The element indicated by @spanTo () must follow the current <> element. @schemeVersion can only be used if @scheme is specified. The <> element should not be categorized in detail with @subtype unless also categorized in general with @type. @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. Abstract model violation: Paragraphs may not occur inside other paragraphs or <ab> elements. Abstract model violation: Metrical lines (<l> elements) 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>. 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">. When @target is present, neither @from nor @to should be. When @from is present, the @to attribute of <> is required. When @to is present, the @from attribute of <> is required. Only one of the attributes @target and @cRef may be supplied on <>. Only one of the attributes @target and @cRef may be supplied on <>. The content of a "gloss" list should include a sequence of one or more pairs of a <label> element followed by an <item> element. If the @target attribute on is used, the relatedItem element must be empty. A relatedItem element should have either a @target attribute or a child element to indicate the related bibliographic item. Abstract model violation: Metrical lines (<l> elements) may not contain <l> or <lg> elements. An <lg> element must contain at least one child <l>, <lg>, or <gap> element. Abstract model violation: Lines may not contain line groups. On <>, either the @marks attribute should be used, or a paragraph of description provided. An XPath in @match on the outer <> must start with '/'. An XPath in @match must not start with '/' except on the outer <>. Abstract model violation: Metrical lines (<l> elements) may not contain higher-level structural elements such as <div>, unless <div> is a descendant of <floatingText>. Abstract model violation: <p> and <ab> may not contain higher-level structural elements such as <div>, unless <div> is a descendant of <floatingText>.