code: private String getSchema() {
          if (Utils.isEmpty(m_config.schema)) {
              m_config.schema = m_config.root + m_config.app + ".xml";
          }
          File schemaFile = new File(m_config.schema);
          if (!schemaFile.exists()) {
              logErrorThrow("Schema file not found: {}", m_config.schema);
          }
          StringBuilder schemaBuffer = new StringBuilder();
          char[] charBuffer = new char[65536];
          try (FileReader reader = new FileReader(schemaFile)) {
              for (int bytesRead = reader.read(charBuffer); bytesRead > 0; bytesRead = reader.read(charBuffer)) {
                  schemaBuffer.append(charBuffer, 0, bytesRead);
              }
          } catch (Exception e) {
              logErrorThrow("Cannot read schema file '{}': {}", m_config.schema, e);
          }
          return schemaBuffer.toString();
      }
docs: Load schema contents from m_config.schema file.