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    <p>It has to be a valid <a href="http://www.w3.org/TR/CSS2/syndata.html#characters" rel="nofollow noreferrer">CSS identifier</a> (the <code>ident</code> <a href="http://www.w3.org/TR/CSS21/grammar.html#scanner" rel="nofollow noreferrer">here</a>) and there should be no duplicates.</p> <blockquote> <p>In CSS, identifiers (including element names, classes, and IDs in <a href="http://www.w3.org/TR/CSS21/grammar.html#scanner" rel="nofollow noreferrer">selectors</a>) can contain only the characters <code>[a-zA-Z0-9]</code> and ISO 10646 characters <code>U+00A1</code> and higher, plus the hyphen (<code>-</code>) and the underscore (<code>_</code>); they cannot start with a digit, or a hyphen followed by a digit. Identifiers can also contain escaped characters and any ISO 10646 character as a numeric code (see next item). For instance, the identifier <code>"B&amp;W?"</code> may be written as <code>"B\&amp;W\?"</code> or <code>"B\26 W\3F"</code>.</p> </blockquote> <h3>See also:</h3> <ul> <li><a href="https://stackoverflow.com/questions/2812072/allowed-characters-for-css-identifiers/2812097#2812097">Allowed characters for CSS identifiers</a></li> </ul> <hr> <p><strong>Update</strong>: for the case you're interested, here's the source code of the validator as provided by <code>UIComponentBase#validateId()</code>:</p> <pre><code>private static void validateId(String id) { if (id == null) { return; } int n = id.length(); if (n &lt; 1) { throw new IllegalArgumentException("Empty id attribute is not allowed"); } for (int i = 0; i &lt; n; i++) { char c = id.charAt(i); if (i == 0) { if (!Character.isLetter(c) &amp;&amp; (c != '_')) { throw new IllegalArgumentException(id); } } else { if (!Character.isLetter(c) &amp;&amp; !Character.isDigit(c) &amp;&amp; (c != '-') &amp;&amp; (c != '_')) { throw new IllegalArgumentException(id); } } } } </code></pre> <p>It's however a little more strict than the CSS rules. They cannot start with a hyphen as well.</p>
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    1. COBINGO! can't start with a digit! I appreciate the whole page because I could spend all day replaceing characters and appending text and not get all the rules right 100% of the time. Thanks
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    2. COYou're welcome.
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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