Added xsd support

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This is a simple XML requirements viewer application consisting of:
+- `xml_requirements_viewer.html` - A standalone HTML application for viewing XML requirements
+- `sample_requirements.xml` - A sample XML file containing formatted requirements
+
+## Architecture
+
+The project is a single-page HTML application with embedded CSS and JavaScript. No build process, dependencies, or server is required - it runs entirely in the browser.
+
+### Core Components
+
+- **HTML Structure**: Standard HTML5 with responsive design
+- **CSS Styling**: Embedded styles with dark mode support via `@media (prefers-color-scheme: dark)`
+- **JavaScript Functionality**: 
+  - Drag-and-drop file handling
+  - XML parsing using DOMParser
+  - Dynamic DOM manipulation for requirements display
+
+### XML Structure
+
+The viewer expects XML files with this structure:
+```xml
+<requirements>
+    <requirement id="REQ-XXX">
+        <title>Title</title>
+        <priority>High/Medium/Low</priority>
+        <category>Category</category>
+        <text>HTML-formatted requirement text with custom tags</text>
+        <status>Active/Draft</status>
+    </requirement>
+</requirements>
+```
+
+### Custom XML Tags Supported
+
+The viewer supports various custom formatting tags within `<text>` elements:
+- Text formatting: `<strong>`, `<em>`, `<u>`, `<del>`, `<sup>`, `<sub>`, `<mark>`, `<small>`
+- Code elements: `<code>`, `<kbd>`, `<samp>`, `<var>`, `<pre>`
+- Semantic tags: `<critical>`, `<optional>`, `<deprecated>`, `<todo>`
+- Technical tags: `<value>`, `<unit>`, `<term>`, `<acronym>`, `<version>`
+- Structure: `<br>`, `<hr>`, `<ul>`, `<ol>`, `<li>`, `<blockquote>`
+- References: `<ref>`, `<url>`, `<link>`
+
+## Usage
+
+Open `xml_requirements_viewer.html` in a web browser and drag/drop or select XML files to view formatted requirements.