This is the first of a multi-part post that examines the issues preventing easy integration of X3D into DOM. This post lists the specific issues and provides some background. It links to other posts that discuss the issue in more detail and in some cases provide possible solutions.
The X3D language uses mixed case node and field names. In some cases field values are specified as case-specific names. This is standard XML. HTML allows for any case and converts tags and attribute names to lower case before use. The HTML language does not impose specific case requirements on attribute values. XHTML is XML-based, so it is case sensitive; however, all tag and attribute names are defined as lowercase.
This is part of a multi-part post that explores some ideas for integrating X3D into HTML5 DOM. It explores various options and their implications. The primary post is "Integrating X3D into DOM - Issues".