pdaValue

none, and value is the expression in the content. The difference with attributes is that they are more like annotation; basically key/value string to add more information in a software specified way.

Structure

This element does not have elements. The attributes are shown below, in a sorted per type fashion.

XSD

The schema file can be downloaded or viewed at xPDK_Base.

Details

Type pdaValueDouble

degrees for angles. The expression is in the content.

Expression need to be commonly evaluated by many software, so having a restricted set of math / types and so on is key. In PDAFlow lib2/expr there is a yacc/lex parser available with some unit support as well as double / complex expressions. An alternative is tinyexpr, but this is more restrictive, so may be very unhandy for things like waveguide model expressions.

allowedValues

Type pdaStringList documentation: text (attribute or element).

type

Type pdaValueType documentation: expression is an extension to what the 'simple code' can do, but runs partly in xPDK:expr spt.
Allowed types:

boolean:
int: xPDK:expr supported
unsigned: xPDK:expr supported
double: xPDK:expr supported
string:
point: xPDK:expr supported
complex: xPDK:expr supported
ref_xsection: reference to xsection
ref_layer: reference to (app)layer
ref_bb: reference to bb

unit

Type pdaUnit documentation:
The use of units is strongly recommended to ensure that values are consistent between provider and user of data. The XSD schema allows a series of "basic units" with a * and / them. A basic unit uses the standard prefixes qryzafpnumckMGTPEZYRQ followed by its type and an optional ^. So a unit can be something like 1/cm*3kV/m^3/degree*dB
A few additional names are added. You can use them with the common prefixes.

Loss: dB/cm
bps: byte/second
degC: temperature in degree Celcius
degree or deg: angle in degree (0-360)
radian or rad: angle in radians (0-2PI)
dB: Decibel
eV: Electron Volt (no prefix)
none: No type / dimensionless value (no prefix)
facet: Support fiber or grating coupler spec

bbTestMax

the BB test files to make the design more clear, so not having bends with 359deg which are then shown as "racetrack". Type pdaExpression documentation:
Expression need to be commonly evaluated by many software, so having a restricted set of math / types and so on is key. In PDAFlow lib2/expr there is a yacc/lex parser available with some unit support as well as double / complex expressions. An alternative is tinyexpr, but this is more restrictive, so may be very unhandy for things like waveguide model expressions.

bbTestMin

the BB test files to make the design more clear, so not having bends with -359deg which are then shown as "racetrack". Type pdaExpression documentation:
Expression need to be commonly evaluated by many software, so having a restricted set of math / types and so on is key. In PDAFlow lib2/expr there is a yacc/lex parser available with some unit support as well as double / complex expressions. An alternative is tinyexpr, but this is more restrictive, so may be very unhandy for things like waveguide model expressions.

doc

max

rule checking or user interface aspects. Type pdaExpression documentation:
Expression need to be commonly evaluated by many software, so having a restricted set of math / types and so on is key. In PDAFlow lib2/expr there is a yacc/lex parser available with some unit support as well as double / complex expressions. An alternative is tinyexpr, but this is more restrictive, so may be very unhandy for things like waveguide model expressions.

min

noParameterRangeTest

Type noParameterRangeTest documentation:

Default value for all parameters
Iterate through the parameters;
- if min or max value defined, then use those to place more instances

This provides for a convenient non-default value testing also, however it may be that those parameter combinations are not valid. Per parameter the min/max may work, but it can be that the minimum of one parameter requires a non-default value for another one.
Setting this property in the BB definition allows to define such a test pattern, for now this is not yet used, so any string is fine.

not0

within the optional range [min,max]. Give the exclusion range [-v,v] for the test. Type pdaExpression documentation:
Expression need to be commonly evaluated by many software, so having a restricted set of math / types and so on is key. In PDAFlow lib2/expr there is a yacc/lex parser available with some unit support as well as double / complex expressions. An alternative is tinyexpr, but this is more restrictive, so may be very unhandy for things like waveguide model expressions.