%entities; ]> The @filebase attribute is deprecated (2014-05-04) and no code remains (2018-07-21), convert to using @xml:id for this purpose The <cite> element is deprecated (2014-06-25) and no code remains (2018-07-21), convert to an <xref> The <circum> element is deprecated (2015-01-28) and no code remains (2018-07-22), convert to a <circumflex> @copy on a "sage" element was deprecated (2017-12-21) Use the xinclude mechanism with common code in an external file @copy on an "image" element was deprecated (2017-12-21) Perhaps use the xinclude mechanism with common code in an external file An <xref> within an <author> is meant to point to a <contributor>, not to a < > There should be at most one <latex-image-preamble> without a @syntax within the <docinfo> element. There are more than one, and they should be consolidated. There should be at most one <latex-image-preamble> with @syntax having value 'PGtikz' within the <docinfo> element. There are more than one, and they should be consolidated. A <sidebyside> normally does not have a single panel. If this construct is only for layout control, try moving layout onto the element used as panel (" ") and remove the <sidebyside> You have a title containing m but no shorttitle. Because this title will be used many places, errors may result. Please add a shorttitle. You have an image without a description and do not declare the image to be decorative. Because of this, output may not be accessible. If the image does not add information that is not already present, use @decorative="yes". Otherwise, provide a <description>. You have an image with @decorative="yes" that has a nonempty description. The description may not appear in output. Either remove the description, remove @decorative, or change @decorative to "no". You have an image description that is more than 125 characters long. Some screen readers will cut off reading alt text after the 125th character. Rewrite the description to be 125 characters or fewer. The <var> element is exclusive to a WeBWorK problem, and so must only appear within a <webwork> element, not here. It will be ignored. Column-specific top border attributes are not implemented for the output of a WeBWorK PG table produced by WeBWorK's hardcopy production engine Cell-specific bottom border border attributes are not implemented for the output of a WeBWorK PG table produced by WeBWorK's hardcopy production engine 'medium' or 'major' table rule attributes will be handled as 'minor' in the output of a WeBWorK PG table produced by WeBWorK's hardcopy production engine A run of text contains a Unicode character for a degree symbol (U+00B0, decimal 176). Likely this was introduced in a conversion of source material authored in a word-processor. The symbol will behave better as the empty element "<degree/>" A run of text contains a Unicode character for a multiplication sign (U+00D7, decimal 215). Likely this was introduced in a conversion of source material authored in a word-processor. The symbol will behave better as the empty element "<times/>" A run of text contains a Unicode character for zero-width character (U+200B, decimal 8203). Likely this was introduced in a conversion of source material authored in a word-processor. It is unnecessary and likely to cause errors. It should be removed. A run of text contains a Unicode character for an en-dash (U+2013, decimal 8211). Likely this was introduced in a conversion of source material authored in a word-processor. The en-dash will behave better as the empty element "<ndash/>". Understand the difference between an en-dash and an em-dash before editing. An en-dash is used for a range, such as the years 2013-22. A run of text contains a Unicode character for an em-dash (U+2014, decimal 8212). Likely this was introduced in a conversion of source material authored in a word-processor. The em-dash will behave better as the empty element "<mdash/>". Understand the difference between an en-dash and an em-dash before editing. An em-dash is used for a pause in a sentence, and should not be authored with a space on either side. A run of text contains Unicode characters for single quotation marks (U+2018, decimal 8216; U+2019, decimal 8217). Likely this was introduced in a conversion of source material authored in a word-processor. A U+2019 in isolation could be an apostrophe. Replace it with the keyboard version: U+0027. A matching pair U+2018, U+2019 should be replaced by the "<sq>" element enclosing content. In rare cases, U+2018 might be replaced by the empty element "<lsq/>". In rare cases, U+2019 might be replaced by the empty element "<rsq/>". A run of text contains Unicode characters for double quotation marks (U+201C, decimal 8220; U+201D, decimal 8221). Likely this was introduced in a conversion of source material authored in a word-processor. A matching pair U+201C, U+201D should be replaced by the "<q>" element enclosing content. In rare cases, U+201C might be replaced by the empty element "<lq/>". In rare cases, U+201D might be replaced by the empty element "<rq/>". ################################################################ PTX: ERROR WARNING ADVICE ################################################################ Validation+ stylesheet is passing incorrect severity ("") ################################################################ : / [ ]