Validation errors

If code is poetry, then it’s pretty awful to read on a blank slate:

Validation Output: 5 Errors
 Line 53, Column 135: Bad value category tag for attribute rel on element a: Keyword category is not registered.
…e="View all posts in Uncategorized" rel="category tag">Uncategorized</span>
Syntax of link type valid for <a> and <area>:
A whitespace-separated list of link types listed as allowed on </a><a> and <area> in the HTML specification or listed as an allowed on </a><a> and <area> on the Microformats wiki without duplicate keywords in the list. You can register link types on the Microformats wiki yourself.
 Line 64, Column 127: Duplicate ID searchform.
…_search"><form method="get" id="searchform" action="">

 Line 29, Column 70: The first occurrence of ID searchform was here.
<form method="get" id="searchform" action="http://elaboratewebs.com/">

 Line 65, Column 24: Duplicate ID search-inputs.
<div id="search-inputs">

 Line 30, Column 24: The first occurrence of ID search-inputs was here.
<div id="search-inputs">

 Line 66, Column 46: Duplicate ID s.
<input type="text" value="" name="s" id="s" />

 Line 31, Column 46: The first occurrence of ID s was here.
<input type="text" value="" name="s" id="s" />

 Line 67, Column 56: Duplicate ID searchsubmit.
<input type="submit" id="searchsubmit" value="Search" />

 Line 32, Column 56: The first occurrence of ID searchsubmit was here.
<input type="submit" id="searchsubmit" value="Search" />

Who’s fault is it and who is going to fix it.