1. Patching document:
<?xml version="1.0" encoding="UTF-8"?>
<root> 
  <foo a="1"/>
  <foo a="2"/>
</root>

Patch:
<add msel="*/foo">
    <bar a="3"/>
  </add>
patch succeeded.

Updated document:
<?xml version="1.0" encoding="UTF-8"?>
<root> 
  <foo a="1">
    <bar a="3"/>
  </foo>
  <foo a="2">
    <bar a="3"/>
  </foo>
</root>

2. Patching document:
<?xml version="1.0" encoding="UTF-8"?>
<root> 
  <foo a="1">
    <bar a="3"/>
  </foo>
  <foo a="2">
    <bar a="3"/>
  </foo>
</root>

Patch:
<add msel="*/foo[@a='1']">
    <!-- comment -->
    <bar a="7"/>
  </add>
patch succeeded.

Updated document:
<?xml version="1.0" encoding="UTF-8"?>
<root> 
  <foo a="1">
    <bar a="3"/>
  
    <!-- comment -->
    <bar a="7"/>
  </foo>
  <foo a="2">
    <bar a="3"/>
  </foo>
</root>

3. Patching document:
<?xml version="1.0" encoding="UTF-8"?>
<root> 
  <foo a="1">
    <bar a="3"/>
  
    <!-- comment -->
    <bar a="7"/>
  </foo>
  <foo a="2">
    <bar a="3"/>
  </foo>
</root>

Patch:
<add msel="*/foo/bar">
      <bar a="4"/>
    </add>
patch succeeded.

Updated document:
<?xml version="1.0" encoding="UTF-8"?>
<root> 
  <foo a="1">
    <bar a="3">
      <bar a="4"/>
    </bar>
  
    <!-- comment -->
    <bar a="7">
      <bar a="4"/>
    </bar>
  </foo>
  <foo a="2">
    <bar a="3">
      <bar a="4"/>
    </bar>
  </foo>
</root>

4. Patching document:
<?xml version="1.0" encoding="UTF-8"?>
<root> 
  <foo a="1">
    <bar a="3">
      <bar a="4"/>
    </bar>
  
    <!-- comment -->
    <bar a="7">
      <bar a="4"/>
    </bar>
  </foo>
  <foo a="2">
    <bar a="3">
      <bar a="4"/>
    </bar>
  </foo>
</root>

Patch:
<remove msel="//@a"/>
patch succeeded.

Updated document:
<?xml version="1.0" encoding="UTF-8"?>
<root> 
  <foo>
    <bar>
      <bar/>
    </bar>
  
    <!-- comment -->
    <bar>
      <bar/>
    </bar>
  </foo>
  <foo>
    <bar>
      <bar/>
    </bar>
  </foo>
</root>

5. Patching document:
<?xml version="1.0" encoding="UTF-8"?>
<root> 
  <foo>
    <bar>
      <bar/>
    </bar>
  
    <!-- comment -->
    <bar>
      <bar/>
    </bar>
  </foo>
  <foo>
    <bar>
      <bar/>
    </bar>
  </foo>
</root>

Patch:
<remove msel="//bar" ws="both"/>
patch succeeded.

Updated document:
<?xml version="1.0" encoding="UTF-8"?>
<root> 
  <foo><!-- comment --></foo>
  <foo/>
</root>

6. Patching document:
<?xml version="1.0" encoding="UTF-8"?>
<root> 
  <foo><!-- comment --></foo>
  <foo/>
</root>

Patch:
<remove msel="*/foo" ws="after"/>
patch succeeded.

Updated document:
<?xml version="1.0" encoding="UTF-8"?>
<root> 
  </root>

Patching successful