The best replacement for schema is schemata.

The best alternatives to schema are rated as following:
★★★★★  schemata
★★★★  scheme
★★★  dtd
★★★  database
★★  script
★★  schematic
★  user
★  tablespace
★  instance
★  snowflake schema
★  snowflake
★  schemas
★  stereotype
★  data-vocabulary
★  background knowledge
★  database mysql
★  microformats
  wsdl
  dsn
  data dictionary
  model
  hcard
  new database
  data model
  star schema
  relational database
  database oracle
  snow flake schema
  prior knowledge
  user oracle
  xml dtd
  cube
  erd

Your alternative for schema is not listed? Suggest!
Speaking about schema, one probably shouldn't forget about user.

Other search terms related to schema and their ratings are:
★★★★★ user
xml
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Google Trends

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schema
schemata
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