### XPath Expression Example

Source: https://github.com/ballsteve/xrust/blob/main/README.md

Demonstrates an XPath expression that evaluates a boolean condition. This expression will be compiled into the same internal format as an equivalent XSLT if statement.

```xpath
if $a then "a is true" else ""
```

--------------------------------

### XSLT If Statement Example

Source: https://github.com/ballsteve/xrust/blob/main/README.md

An XSLT if statement that achieves the same result as the XPath expression. Both syntaxes are mapped to a common internal χrust transformation representation.

```xml
<xsl:if test="$a">
  a is true
</xsl:if>
```

--------------------------------

### Identity XSLT Stylesheet

Source: https://github.com/ballsteve/xrust/wiki/IdentityXSLT

This stylesheet copies all elements and attributes from the source XML document to the result document, creating an exact replica.

```XSLT
<xsl:stylesheet
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="3.0">

  <xsl:template match="*|@*">
    <xsl:copy>
      <xsl:apply-templates select="@*|node()"/>
    </xsl:copy>
  </xsl:template>

</xsl:stylesheet>
```

--------------------------------

### XSLT Stylesheet for Pretty Printing XML

Source: https://github.com/ballsteve/xrust/wiki/Pretty-Print

This XSLT stylesheet indents XML output and strips insignificant whitespace. Use it when you need to format XML for human readability.

```XSLT
<xsl:stylesheet version='1.0'
  xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>

  <xsl:output indent='yes'/>
  <xsl:strip-space elements='*'/>

  <xsl:template match="*|@*">
    <xsl:copy>
      <xsl:apply-templates select="@*|node()"/>
    </xsl:copy>
  </xsl:template>
</xsl:stylesheet>
```

--------------------------------

### Second XML Canonical Form Grammar

Source: https://github.com/ballsteve/xrust/blob/main/tests/conformance/xml/xmlconf/sun/cxml.html

Extends the Canonical XML grammar to include DTDs with notation declarations. Literals are required to be surrounded by single quotes.

```xml
CanonXML2    ::= DTD2? CanonXML
DTD2         ::= '<!DOCTYPE ' name ' [' #xA Notations? ']' #xA 
Notations    ::= ( '<!NOTATION ' Name '
			(('PUBLIC ' PubidLiteral ' ' SystemLiteral)
			|('PUBLIC ' PubidLiteral)
			|('SYSTEM ' SystemLiteral))
			'>' #xA )*
```

--------------------------------

### Empty XSLT Stylesheet for Stripping Markup

Source: https://github.com/ballsteve/xrust/wiki/Strip-Markup

This is the most basic XSLT 3.0 stylesheet. When applied, it effectively removes all markup, preserving only the character data from the input document. No specific imports are needed as it utilizes built-in XSLT templates.

```XSLT
<xsl:stylesheet version="3.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
</xsl:stylesheet>
```

--------------------------------

### Third XML Canonical Form Grammar

Source: https://github.com/ballsteve/xrust/blob/main/tests/conformance/xml/xmlconf/sun/cxml.html

Extends the Second XML Canonical Form grammar to include DTDs with unparsed entity declarations for attribute values. This form accounts for whitespace in element content and external identifiers for unparsed entities.

```xml
CanonXML3    ::= DTD3? CanonXML
DTD3         ::= '<!DOCTYPE ' name ' [' #xA Notations? Unparsed? ']' #xA 
Unparsed    ::= ( '<!ENTITY ' Name '
			(('PUBLIC ' PubidLiteral ' ' SystemLiteral)
			|('SYSTEM ' SystemLiteral))
			'NDATA ' Name
			'>' #xA )*
```

--------------------------------

### Canonical XML Grammar

Source: https://github.com/ballsteve/xrust/blob/main/tests/conformance/xml/xmlconf/sun/cxml.html

Defines the grammar for the First XML Canonical Form, also known as Canonical XML. It specifies the structure of elements, attributes, processing instructions, and data characters, encoded in UTF-8.

```xml
CanonXML    ::= Pi* element Pi*
element     ::= Stag (Datachar | Pi | element)* Etag
Stag        ::= '<'  Name Atts '>'
Etag        ::= '</' Name '>'
Pi          ::= '<?' Name ' ' (((Char - S) Char*)? - (Char* '?>' Char*)) '?>'
Atts        ::= (' ' Name '=' '"' Datachar* '"')*
Datachar    ::= '&amp;' | '&lt;' | '&gt;' | '&quot;'
                 | '&#9;'| '&#10;'| '&#13;'
                 | (Char - ('&' | '<' | '>' | '"' | #x9 | #xA | #xD))
Name        ::= (see XML spec)
Char        ::= (see XML spec)
S           ::= (see XML spec)
```

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