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Names of variables, categories and other elements of a variable, and filters must conform to the following rules:
► The first character must be a letter or the _ (underscore) symbol.
► Subsequent characters can be:
• Letters.
• Decimal numbers from either Basic Latin or other national scripts.
• The @, $, #, or _ symbols.
► Embedded spaces and special characters are not allowed.
A letter is any English letter character (a-z, A-Z) or a letter character from another language.
Prior to IBM® SPSS® Data Collection version 6.0.1, the following keywords were reserved. Starting with version 6.0.1, the following words can be used for the names of variables, elements, or filters.
| Add | Date | Group | Nonamespace | Row |
| All | Dateonly | Having | Null | Select |
| Alter | Default | Hdata | Object | Set |
| Alternatives | Define | Helperfields | On | Stddev |
| Area | Delete | Info | Order | Step |
| As | Desc | Insert | Other | Sum |
| Asc | Descending | Into | Otherspecify | Style |
| Ascending | Double | Item | Parentquestion | Table |
| Avg | Drop | Label | Precision | Text |
| Axis | Elementtype | Labeltypes | Properties | Timeonly |
| Base | End | Languages | Protected | True |
| Block | Errors | Layouttemplate | Questionfullname | Truncate |
| Boolean | Exclusive | Lcl | Questioninfo | Type |
| By | Exec | Level | Questionname | Update |
| Categorical | Expand | Long | Questiontype | Usagetype |
| Categories | Expression | Loop | Ran | Use |
| Column | False | Metadata | Randomize | Validation |
| Compound | Fields | Max | Rev | Value |
| Contexts | Fix | Min | Reverse | Values |
| Count | From | Namespace | Rot | Where |
| Create | Grid | Nocasedata | Rotate | With |