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<?xml version="1.0"?>
<types>
<doc>
Core Types for Context properties
=================================
Fundamental types
-----------------
</doc>
<type name="value">
<doc>
Any representable value.
</doc>
</type>
<type name="bool" base="value">
<doc>
A boolean.
</doc>
</type>
<type name="number" base="value">
<params>
<min doc="Lower bound" type="number"/>
<max doc="Upper bound" type="number"/>
</params>
<doc>
A number with in the range indicated by the "min" and
"max" parameters. The value is represented as either a
"int32", "uint32", "int64", "uint64", or "double".
</doc>
</type>
<type name="integer" base="number">
<params>
<min doc="Lower bound" type="number"/>
<max doc="Upper bound" type="number"/>
</params>
<doc>
A integer, represented as any of the numeric types. If the value
is a "double", it is rounded to an integer, but not necessarily to
the nearest. The "min" and "max" parameters, when given, constrain
the range of the integer.
</doc>
</type>
<type name="string" base="value">
<doc>
A string.
</doc>
</type>
<type name="list" base="value">
<params>
<min doc="Minimum length" type="integer"/>
<max doc="Maximum length" type="integer"/>
<type doc="Element type" type="type"/>
</params>
<doc>
A list with elements of the given type and minimum and
maximum length given by the "min" and "max" parameters,
respectively.
+
When the "type" parameter is omitted, it defaults to
"value".
</doc>
</type>
<type name="map" base="value">
<params>
<rest doc="The allowed keys"/>
</params>
<doc>
A map. The parameters specify the allowed keys in the map.
+
Each parameter is a association tree that describes one
possible key. The name of the tree is the key itself, and
the second level of the tree can have "doc" and "type"
attributes for that key.
+
When the special key name "allow-other-keys" is present,
all keys are allowed; otherwise, only the specified keys
have any meaning and additional keys are an error.
+
When no parameters are given, all keys are allowed.
</doc>
</type>
<doc>
Generic types
-------------
</doc>
<type name="association-tree" base="value">
<doc>
A tree made from nested lists, used to associate
(hierarchical) keys with values.
+
For example, the association tree
+
[ "foo", [ "bar", 12 ], [ "baz", 42 ] ]
+
associates "foo", "bar" with 12 and "foo", "baz" with 42.
+
Association trees are often used as a simple "Nano DOM" for
XML documents.
+
Formally, a association tree is a list whose first element is
a string, and whose rest elements are either association
trees, or a single value.
+
The "name" of a association tree is the first element of its
top-level list.
+
As a special case, a association tree with just a name and no
other elements can be abbreviated by just stating the name as
a string. E.g., the following two values are equivalent when
considered as a association tree:
+
"foo"
[ "foo" ]
</doc>
</type>
<type name="association-list">
<base>
<list type="association-tree"/>
</base>
<doc>
A list of association trees.
</doc>
</type>
<type name="string-enum" base="string">
<params>
<rest doc="The possible values"/>
</params>
<doc>
This is the base type for enumerations of fixed strings. The
parameters describe the possible values.
+
Each parameter is a association tree that describes one of
the choices. The name of the association tree is the
string for the choice itself and the second level of the
tree can have a "doc" attribute for that choice.
</doc>
</type>
<type name="int-enum" base="integer">
<params>
<rest doc="The possible values"/>
</params>
<doc>
This is the base type for enumerations of fixed integers.
The parameters describe the possible values.
+
Each parameter is a association tree that describes one of
the choices. The name of the association tree is a
symbolic name for the choice itself and the second level
of the tree must have a "value" attribute that gives the
numerical value of the choice in decimal. A choice can
also have a "doc" attribute, of course.
</doc>
</type>
<doc>
Specific types
--------------
</doc>
<type name="type"
base="association-tree">
<doc>
A reference to a type, consisting of a name and optional
parameters.
+
Type references are just association trees: the name of
the tree names the referenced type, and the associations
of the association tree are the parameters.
</doc>
</type>
<type name="temperature"
doc="A temperature in Kelvin.">
<base>
<number min="0"/>
</base>
</type>
<type name="energy"
base="number">
<doc>
An amount of energy, in Joule.
</doc>
</type>
<type name="power"
base="number">
<doc>
A power, in Watt.
</doc>
</type>
<type name="time"
base="integer">
<doc>
A point in time, represented as the number of nano-seconds since
00:00 January 1, 1970, UTC.
</doc>
</type>
<type name="duration"
base="integer">
<doc>
A time duration, in nano-seconds.
</doc>
</type>
<type name="percentage">
<base>
<integer min="0" max="100"/>
</base>
<doc>
A percentage.
</doc>
</type>
<type name="location-source">
<base>
<string-enum>
<satellite/>
<wlan/>
<cellular/>
<timezone/>
</string-enum>
</base>
<doc>
Describes a source of location information. Possible values are
"satellite", "wlan", "cellular", and "timezone".
</doc>
</type>
<type name="tracker-uri"
base="string">
<doc>
A URI that names a object in the Tracker object store.
</doc>
</type>
</types>
|
