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| 1 : | parrello | 1.1 | <?xml version='1.0' standalone='yes'?> |
| 2 : | <Database> | ||
| 3 : | <Title>Attributes Database</Title> | ||
| 4 : | <Entities> | ||
| 5 : | <Entity name="AttributeGroup" keyType="name-string"> | ||
| 6 : | <Notes>A [i]group[/i] is a named set of attribute keys. An attribute key can belong to | ||
| 7 : | many groups or none at all.</Notes> | ||
| 8 : | </Entity> | ||
| 9 : | <Entity name="AttributeKey" keyType="name-string"> | ||
| 10 : | <Notes>An [i]attribute key[/i] describes named values attached to a particular type of object. | ||
| 11 : | Each instance of this entity contains the attribute's description and its name. An attribute | ||
| 12 : | key name must consist of letters, numbers, periods, underscores, and hyphens.</Notes> | ||
| 13 : | <Fields> | ||
| 14 : | <Field name="description" type="text"> | ||
| 15 : | <Notes>Text describing the attribute. This should explain what the attribute means and | ||
| 16 : | what kinds of values are appropriate.</Notes> | ||
| 17 : | </Field> | ||
| 18 : | <Field name="data-type" type="name-string"> | ||
| 19 : | <Notes>ERDB data type for the attribute. This serves as documentation only, but | ||
| 20 : | that may change at some future point.</Notes> | ||
| 21 : | </Field> | ||
| 22 : | </Fields> | ||
| 23 : | </Entity> | ||
| 24 : | <Entity name="Assignment" keyType="hash-string"> | ||
| 25 : | <Notes>An [i]assignment[/i] represents the relationship between an attribute key and | ||
| 26 : | an object. The key is the digest of a string formed by the attribute key name, an equal sign, | ||
| 27 : | and the object ID. Since the key name cannot contain equal signs, the string is enough | ||
| 28 : | to uniquely identify an assignment.</Notes> | ||
| 29 : | <Fields> | ||
| 30 : | <Field name="object-id" type="string"> | ||
| 31 : | <Notes>This is the ID of the object to which the assignment is made.</Notes> | ||
| 32 : | </Field> | ||
| 33 : | <Field name="value" relation="AssignmentValue" type="text"> | ||
| 34 : | <Notes>Value assigned to the object for the specified key. There may be more than | ||
| 35 : | one value assigned.</Notes> | ||
| 36 : | </Field> | ||
| 37 : | </Fields> | ||
| 38 : | <Indexes> | ||
| 39 : | <Index> | ||
| 40 : | <Notes>This index allows the user to search for assignments with a particular value.</Notes> | ||
| 41 : | <IndexFields> | ||
| 42 : | <IndexField name="value" order="ascending" /> | ||
| 43 : | </IndexFields> | ||
| 44 : | </Index> | ||
| 45 : | <Index> | ||
| 46 : | <Notes>This index allows the user to search for all assignments to a particular object.</Notes> | ||
| 47 : | <IndexFields> | ||
| 48 : | <IndexField name="object-id" order="ascending" /> | ||
| 49 : | </IndexFields> | ||
| 50 : | </Index> | ||
| 51 : | </Indexes> | ||
| 52 : | </Entity> | ||
| 53 : | </Entities> | ||
| 54 : | <Relationships> | ||
| 55 : | <Relationship name="IsInGroup" from="AttributeKey" to="AttributeGroup" arity="MM"> | ||
| 56 : | <Notes>This relationship connects an attribute key to the groups of which it is a member.</Notes> | ||
| 57 : | </Relationship> | ||
| 58 : | <Relationship name="IsKeyOf" from="AttributeKey" to="Assignment" arity="1M"> | ||
| 59 : | <Notes>This relationship connects an attribute key to its assignments.</Notes> | ||
| 60 : | </Relationship> | ||
| 61 : | </Relationships> | ||
| 62 : | </Database> |
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