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 @unit attribute may be unnecessary when @unitRef is present. @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 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: Lines may not contain lines 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 . You must supply at least two values for @target or on Abstract model violation: Metrical lines may not contain higher-level divisions such as p or ab, unless ab is a child of figure or note, or is a descendant of floatingText. You must supply at least two values for @target on This element must have a @type attribute, since it is nested inside a Abstract model violation: Metrical lines 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. One of the attributes @name, @ref or @key must be supplied Only one of the attributes @active and @mutual may be supplied the attribute @passive may be supplied only if the attribute @active is supplied A facsimile element represents a text with images, thus transcribed text should not be present within it. The first and last elements of this path are the same. To specify a closed polygon, use the zone element rather than the path element. The @spanTo attribute of is required. The @spanTo attribute of is required. The @spanTo attribute of is required. must have at least one child add and at least one child del or surplus Only one is allowed as a child of . The element should not be used outside of msDesc. The element may appear once only The element may appear once only The element may appear once only The element should not be used outside of msDesc. The element should not be used outside of msDesc. An msIdentifier must contain either a repository or location.