Generated ePubs failing validation

Hello,

Following on from my latest pull request (#412) here are all the ePub validation failures from trying to export the guide.

That pull request should fix the first three errors. The eleven after it appear to be due to those pages having the quick search widget on them and the start button for it. The next two, along with the two at the end, are broken identifiers in the TOC (probably best to leave these until last). The last error is simply a case of an image being called from another server, but ePub needs all those objects. Fixing this last one just means uploading http://www.python.org/dev/peps/pep-0001/pep-0001-1.png to a suitable location and updating intro/community.rst to use the local version.

bash-3.2$ epubcheck.sh pythonguide.epub
Epubcheck Version 3.0

Validating against EPUB version 2.0
ERROR: pythonguide.epub/search.html(17,57): attribute "id" not allowed here; expected attribute "charset", "defer", "src" or "xml:space"
ERROR: pythonguide.epub/search.html(51,32): element "form" not allowed anywhere; expected the element end-tag, text or element "a", "abbr", "acronym", "address", "applet", "b", "bdo", "big", "blockquote", "br", "cite", "code", "del", "dfn", "div", "dl", "em", "h1", "h2", "h3", "h4", "h5", "h6", "hr", "i", "iframe", "img", "ins", "kbd", "map", "noscript", "ns:svg", "object", "ol", "p", "pre", "q", "samp", "script", "small", "span", "strong", "sub", "sup", "table", "tt", "ul" or "var" (with xmlns:ns="http://www.w3.org/2000/svg")
ERROR: pythonguide.epub/search.html(54,66): element "form" not allowed anywhere; expected the element end-tag, text or element "a", "abbr", "acronym", "address", "applet", "b", "bdo", "big", "blockquote", "br", "cite", "code", "del", "dfn", "div", "dl", "em", "h1", "h2", "h3", "h4", "h5", "h6", "hr", "i", "iframe", "img", "ins", "kbd", "map", "noscript", "ns:svg", "object", "ol", "p", "pre", "q", "samp", "script", "small", "span", "strong", "sub", "sup", "table", "tt", "ul" or "var" (with xmlns:ns="http://www.w3.org/2000/svg")
ERROR: pythonguide.epub/dev/virtualenvs.html(61,37): attribute "start" not allowed here; expected attribute "dir", "id", "lang", "style", "title" or "xml:lang"
ERROR: pythonguide.epub/dev/virtualenvs.html(69,37): attribute "start" not allowed here; expected attribute "dir", "id", "lang", "style", "title" or "xml:lang"
ERROR: pythonguide.epub/dev/virtualenvs.html(113,37): attribute "start" not allowed here; expected attribute "dir", "id", "lang", "style", "title" or "xml:lang"
ERROR: pythonguide.epub/dev/virtualenvs.html(124,37): attribute "start" not allowed here; expected attribute "dir", "id", "lang", "style", "title" or "xml:lang"
ERROR: pythonguide.epub/dev/virtualenvs.html(130,37): attribute "start" not allowed here; expected attribute "dir", "id", "lang", "style", "title" or "xml:lang"
ERROR: pythonguide.epub/shipping/freezing.html(167,37): attribute "start" not allowed here; expected attribute "dir", "id", "lang", "style", "title" or "xml:lang"
ERROR: pythonguide.epub/shipping/freezing.html(175,37): attribute "start" not allowed here; expected attribute "dir", "id", "lang", "style", "title" or "xml:lang"
ERROR: pythonguide.epub/shipping/packaging.html(109,37): attribute "start" not allowed here; expected attribute "dir", "id", "lang", "style", "title" or "xml:lang"
ERROR: pythonguide.epub/shipping/packaging.html(116,37): attribute "start" not allowed here; expected attribute "dir", "id", "lang", "style", "title" or "xml:lang"
ERROR: pythonguide.epub/shipping/packaging.html(123,37): attribute "start" not allowed here; expected attribute "dir", "id", "lang", "style", "title" or "xml:lang"
ERROR: pythonguide.epub/shipping/packaging.html(131,37): attribute "start" not allowed here; expected attribute "dir", "id", "lang", "style", "title" or "xml:lang"
ERROR: pythonguide.epub/genindex.html(22,28): '': fragment identifier is not defined in 'genindex.html'
ERROR: pythonguide.epub/index.html(25,25): '': fragment identifier is not defined in 'index.html'
ERROR: pythonguide.epub/intro/community.html(98,130): 'http://www.python.org/dev/peps/pep-0001/pep-0001-1.png': remote resource reference not allowed; resource must be placed in the OCF
ERROR: pythonguide.epub/starting/install/win.html(54,67): 'id1': fragment identifier is not defined in 'starting/install/win.html'
ERROR: pythonguide.epub/writing/tests.html(240,33): 'id6': fragment identifier is not defined in 'writing/tests.html'

Check finished with warnings or errors

bash-3.2$

从 epubcheck.sh pythonguide.epub 开始，将报告中列出的生成文件追溯到其源文件。检查 search.html、dev/virtualenvs.html、shipping/freezing.html、shipping/packaging.html、genindex.html、index.html、starting/install/win.html、writing/tests.html 和 intro/community.rst。列出的 EPUB 2.0 验证错误（包括远程图像引用）全部解决后，即视为完成。