Advanced Jasper Report XML Subreport Assistance

I am currently looking for engineered solutions to elevate my use of Jasper Reports, specifically in managing complex subreport hierarchy and data sources using XML layouts.

Key tasks will involve:
- Breaking down and navigating subreport hierarchy,
- Managing associated subreport data source,
- Enhancing the structure and quality of reports.

Ideal candidates would have the following skills and experience:

- Expert understanding of Jasper Reports,
- Strong knowledge and experience in dealing with subreport hierarchy and managing subreport data sources,
- Proficiency in Java programming language,
- Familiarity with XML layouts.

Through your expertise and my vision, let's push the boundaries of what's feasible with Jasper Reports.