I asked a similar question at What do I need my (ePub) toc.ncx to have?, but thought to create a different question about what to do for a toc.xhtml file.
The error I am getting when I try to validate my ePub 3.0.1 toc.xhtml is:
ERROR OEBPS/toc.xhtml 3 45 Error while parsing file 'element "html" not allowed anywhere; expected element "ns:ncx" (with xmlns:ns="http://www.daisy.org/z3986/2005/ncx/")'.
All the online examples I've seen, for instance epub3-samples, have HTML tags like any other XHTML 1.1 file. ePub Checker seems not to accept this. The toc.xhtml file I have been testing is:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:epub="http://www.idpf.org/2007/ops">
<head>
<meta charset="utf-8" />
<link rel="stylesheet" type="text/css" href="stylesheet.css"
/>
</head>
<body>
<section class="base" id="toc">
<h1>Unvera Announces New Kool-Aid Line</h1>
<nav epub:type="toc">
<h2>Table of Contents</h2>
<ol>
<li><a href="letters.xhtml">The Angelic Letters</a></li>
<li><a href="doxology.xhtml">Doxology</a></li>
<li><a href="narnia.xhtml">A Pilgrimage from Narnia</a></li>
<li><a href="apprentice.xhtml">Apprentice gods</a></li>
<li><a href="singularity.xhtml">Singularity</a></li>
<li><a href="providence.xhtml">Amazing Providence</a></li>
<li><a href="spectacles.xhtml">The Spectacles</a></li>
<li><a href="druid.xhtml">Archdruid of Canterbury Visits Orthodox Patriarch</a></li>
<li><a href="plato.xhtml">Plato: The Allegory of the... <em>Flickering Screen?</em></a></li>
<li><a href="monk.xhtml">A Comparison Between the Mere Monk and the Highest Bishop</a></li>
<li><a href="gandhi.xhtml">Farewell to Gandhi: The Saint and the Activist</a></li>
<li><a href="alchemy.xhtml">How Shall I Tell an Alchemist?</a></li>
<li><a href="philaret.xhtml">Akathist to St. Philaret the Merciful</a></li>
<li><a href="silence.xhtml">Silence: Organic Food for the Soul</a></li>
<li><a href="rules-of-engagement.xhtml">Rules of Engagement</a></li>
<li><a href="technonomicon.xhtml">Technonomicon: Technology, Nature, Ascesis</a></li>
<li><a href="steel.xhtml">Within the Steel Orb</a></li>
<li><a href="memoirs.xhtml">An Author's Musing Memoirs: Retrospective Reflections, Retracings, and Retractions</a></li>
<li><a href="pet.xhtml">A Pet Owner's Rules</a></li>
<li><a href="backswing.xhtml">The Damned Backswing</a></li>
<li><a href="physics.xhtml">'Physics'</a></li>
<li><a href="commentary.xhtml">The Commentary</a></li>
<li><a href="decisive.xhtml">Two Decisive Moments</a></li>
<li><a href="exotic.xhtml">Exotic Golden Ages and Restoring Harmony with Nature: Anatomy of a Passion</a></li>
<li><a href="arena.xhtml">The Arena</a></li>
<li><a href="humility-royal-race.xhtml">The Treasure of Humility and the Royal Race</a></li>
<li><a href="money.xhtml">Money</a></li>
<li><a href="luddite.xhtml">The Luddite's Guide to Technology</a></li>
<li><a href="grail.xhtml">The Sign of the Grail</a></li>
<li><a href="best.xhtml">The Best Things in Life Are Free</a></li>
<li><a href="hymn.xhtml">Hymn to the Creator of Heaven and Earth</a></li>
<li><a href="new-face-old-ecumenism.xhtml">Book Review: A New Face on an Old Ecumenism (<em>The Orthodox Dilemma Second Edition : Personal Reflections on Global Pan-Orthodox Christian Conciliar Unity</em>)</a></li>
<li><a href="ecumenism.xhtml">An Open Letter to Catholics on Orthodoxy and Ecumenism</a></li>
<li><a href="pope.xhtml">Pope Makes Historic Ecumenical Bid to Woo Eastern Rite Catholics</a></li>
<li><a href="calvinist.xhtml">An Orthodox Looks at a Calvinist Looking at Orthodoxy</a></li>
<li><a href="stephanos.xhtml">Stephanos</a></li>
<li><a href="gamechanger.xhtml">God the Game Changer</a></li>
<li><a href="father.xhtml">God the Spiritual Father</a></li>
<li><a href="death.xhtml">Death</a></li>
<li><a href="open.xhtml">Open</a></li>
<li><a href="no_rights.xhtml">Do We Have Rights?</a></li>
<li><a href="knights.xhtml">Knights and Ladies</a></li>
<li><a href="women.xhtml">Where Is the Good of Women? Feminism Is Called the Women's Movement. But Is It?</a></li>
<li><a href="naturally-inclusive-language.xhtml"><em>Belabored Inclusive Language</em> and <em>Naturally Inclusive Language</em></a></li>
<li><a href="greek.xhtml">Inclusive Language Greek Manuscript Discovered</a></li>
<li><a href="picture.xhtml">A Strange Picture</a></li>
<li><a href="unashamed.xhtml">Unashamed</a></li>
<li><a href="unman.xhtml">Un-Man's Tales: C.S. Lewis's <em>Perelandra</em>, Fairy Tales, and Feminism</a></li>
<li><a href="avatar.xhtml">Veni, Vidi, Vomi: A Look at 'Do You Want to Date My Avatar?'</a></li>
<li><a href="dark_patterns.xhtml">Dark Patterns / Anti-Patterns and Cultural Context Study of Scriptural Texts: A Case Study in Craig Keener's <em>Paul, Women, and Wives: Marriage and Women's Ministry in the Letters of Paul</em></a></li>
<li><a href="contraception.xhtml">Orthodoxy, Contraception, and Spin Doctoring: A Look at an Influential but Disturbing Article</a></li>
<li><a href="life.xhtml">A Wonderful Life</a></li>
<li><a href="social-antibodies.xhtml">'Social Antibodies' Needed: A Request of Orthodox Clergy</a></li>
<li><a href="desire.xhtml">Desire</a></li>
<li><a href="transcendent.xhtml">The Transcendent God Who Approaches Us Through Our Neighbor</a></li>
<li><a href="author.xhtml">About the Author</a></li>
<li><a href="interview.xhtml">An Interview with the Author</a></li>
<li><a href="negotiation.xhtml">Friendly, Win-Win Negotiation: Interest-Based Negotiation and <em>Getting to Yes</em></a></li>
<li><a href="theory-of-alien-minds.xhtml">Theory of Alien Minds: A UX Copernican Shift</a></li>
<li><a href="seraphim.xhtml">What Makes Me Uneasy about Fr. Seraphim (Rose) and His Followers</a></li>
<li><a href="dastardly-duo.xhtml">Dastardly Duo Considered Harmful: <em>Our Thoughts Determine Our Lives</em> and <em>Wounded By Love</em></a></li>
<li><a href="religion-science.xhtml">'Religion and Science' Is Not Just Intelligent Design vs. Evolution</a></li>
<li><a href="chemistry.xhtml"><em>QUICK!</em> What Is Your Opinion about Chemistry?</a></li>
<li><a href="creation.xhtml">Creation and Holy Orthodoxy: Fundamentalism Is Not Enough</a></li>
<li><a href="evolution.xhtml">Note to Orthodox Evolutionists: Stop Trying to Retroactively <del>Shanghai</del> Recruit the Fathers to Your Camp!</a></li>
<li><a href="meatspace.xhtml">Game Review: Meatspace</a></li>
<li><a href="grinch.xhtml">The Grinch Who Stole Christmas</a></li>
<li><a href="icons.xhtml">Lesser Icons: Reflections on Faith, Icons, and Art</a></li>
<li><a href="and_all_that.xhtml">1054 and All That</a></li>
<li><a href="God.xhtml">Does God Suffer?</a></li>
<li><a href="monasticism.xhtml">Monasticism for Protestants</a></li>
<li><a href="sacrament.xhtml">The Eighth Sacrament</a></li>
<li><a href="dream.xhtml">A Dream of Light</a></li>
<li><a href="evil.xhtml">A Picture of Evil</a></li>
<li><a href="amusement.xhtml">Religion within the Bounds of Amusement</a></li>
<li><a href="refutatio.xhtml">Refutatio Omnium Haeresium</a></li>
<li><a href="grace.xhtml">A Shaft of Grace</a></li>
<li><a href="waste.xhtml">Why This Waste?</a></li>
<li><a href="yonder.xhtml">Yonder</a></li>
<li><a href="sermon.xhtml">The Most Politically Incorrect Sermon in History: A Commentary on the Sermon on the Mount</a></li>
<li><a href="math-thesis.xhtml">Closeness Spaces: Elementary Explorations Into Generalized Metric Spaces, and Ordered Fields Derived From Them</a></li>
<li><a href="ai.xhtml">AI as an Arena for Magical Thinking Among Skeptics</a></li>
<li><a href="augustine.xhtml">Does Augustine Return to the Interpersonal Image of Love as Representing the Trinity, or Does He Abandon This in Favour of the Psychological Image?</a></li>
<li><a href="cultures.xhtml">Espiriticthus: Cultures of a Fantasy World Not Touched by Evil</a></li>
<li><a href="janra.xhtml">Janra Ball: The Headache</a></li>
<li><a href="maximos.xhtml"><em>Profoundly Gifted Magazine</em> Interviews Maximos Planos</a></li>
<li><a href="profoundly-gifted.xhtml">Profoundly Gifted Survival Guide</a></li>
<li><a href="blackbird.xhtml">The Wagon, the Blackbird, and the Saab</a></li>
<li><a href="fast_track.xhtml"><em>Your</em> Fast Track to Becoming a Bishop!</a></li>
<li><a href="msbp.xhtml">Eight-Year-Old Boy Diagnosed With Machiavellian Syndrome By Proxy (MSBP)</a></li>
<li><a href="converts.xhtml">Evangelical Converts Striving to be Orthodox</a></li>
<li><a href="jobs.xhtml">Jobs for Theologians</a></li>
<li><a href="bac.xhtml">The Modern Baccalaureate</a></li>
<li><a href="firestorm.xhtml">Firestorm 2034</a></li>
<li><a href="monastery.xhtml">The Monastery</a></li>
<li><a href="repentance-heavens-best-kept-secret.xhtml">Repentance, Heaven's Best-Kept Secret</a></li>
<li><a href="oops.xhtml">Oops: Could the Western Rite Please Try Again?</a></li>
<li><a href="glimpse.xhtml">A Glimpse Through a Crystal</a></li>
<li><a href="stranger.xhtml">Looking at <em>Stranger in a Strange Land</em> as a Modern Christological Heresy</a></li>
<li><a href="customer.xhtml">An Open Letter From a Customer: I Don't <strong>Want</strong> to Abuse Your Employees and Be Rewarded for Gaming the System</a></li>
<li><a href="orb.xhtml">The Steel Orb</a></li>
<li><a href="treasure.xhtml">Treasure</a></li>
<li><a href="martial-arts.xhtml">Can You Smoke Without Inhaling? Martial Arts and the Orthodox Christian</a></li>
<li><a href="link-prospectors.xhtml">An Open Letter to <strong>Other</strong> Link Prospectors</a></li>
<li><a href="spam.xhtml">An Open Letter to Spam Patrons</a></li>
<li><a href="character-sheet.xhtml">Character Sheet</a></li>
<li><a href="supercomputers.xhtml">Macs are now Super.Computer.s running 'IRIX,' a Super.Computer. OS!</a></li>
<li><a href="voyage.xhtml">The Voyage</a></li>
<li><a href="dictionary.xhtml">Hayward's Unabridged Dictionary</a></li>
<li><a href="watch.xhtml">The Watch</a></li>
<li><a href="disruptive-unbranding.xhtml">A Disruptive Take on (Un-)Branding</a></li>
<li><a href="mindstorm.xhtml">The Mindstorm</a></li>
<li><a href="kool-aid.xhtml">Unvera Announces New Kool-Aid Line</a></li>
</ol>
</nav>
</section>
</body>
</html>
Does my toc.xhtml need to be changed? If so, how?
