Element id problems

Element id occurs more than once  

Detects duplicate element IDs.

Element id occurs more than once in Markdown file  

Detects duplicate element identifiers in Markdown Writerside topics.

Element without an 'id' attribute  

Highlights elements that don't have the id attribute.

Root file tag must have an 'id' attribute  

Detects missing or incorrect topic IDs in XML files.

Unresolved anchor reference  

Reports unresolved references in Markdown links.