/usr/share/gretl/functions/gretlfunc.dtd is in gretl-common 2016a-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Document Type Definition (DTD) for gretl function packages: a package
needs a name, author, version, date, description and help text. It
also needs at least one gretl-function. The latter must have a name
and must include function code; it may have zero or more
parameters, and zero or one return values. And the package must
contain a sample script which illustrates a correct call.
-->
<!ELEMENT gretl-functions (gretl-function-package?)>
<!ELEMENT gretl-function-package (author, version, date, description, tags?,
label?, menu-attachment?, help, gui-help?,
data-files?, gretl-function+, sample-script)>
<!ATTLIST gretl-function-package
name CDATA #REQUIRED
ID CDATA #IMPLIED
needs-time-series-data (true|false) 'false'
needs-qm-data (true|false) 'false'
needs-panel-data (true|false) 'false'
no-data-ok (true|false) 'false'
has-pdf-doc (true|false) 'false'
lives-in-subdir (true|false) 'false'
model-requirement CDATA #IMPLIED
minver CDATA #IMPLIED
>
<!ELEMENT author (#PCDATA)>
<!ELEMENT version (#PCDATA)>
<!ELEMENT date (#PCDATA)>
<!ELEMENT description (#PCDATA)>
<!ELEMENT tags (#PCDATA)>
<!ELEMENT label (#PCDATA)>
<!ELEMENT menu-attachment (#PCDATA)>
<!ATTLIST author
email CDATA #REQUIRED
>
<!ATTLIST description
lang CDATA #IMPLIED
>
<!ELEMENT gretl-function (params?, return?, code)>
<!ATTLIST gretl-function
name CDATA #REQUIRED
type (void | scalar | series | matrix | list | string | bundle | strings | matrices | bundles | lists) 'void'
private (0|1) '0'
plugin-wrapper (0|1) '0'
no-print (0|1) '0'
menu-only (0|1) '0'
pkg-role (bundle-print | bundle-plot | bundle-test | bundle-fcast |
bundle-extra | gui-main | gui-precheck | none) 'none'
>
<!ATTLIST help
filename CDATA #IMPLIED
>
<!ATTLIST gui-help
filename CDATA #IMPLIED
>
<!ELEMENT help (#PCDATA)>
<!ELEMENT gui-help (#PCDATA)>
<!ELEMENT data-files (#PCDATA)>
<!ATTLIST data-files
count CDATA #REQUIRED
>
<!ELEMENT params (param+)>
<!ATTLIST params
count CDATA #REQUIRED
>
<!ELEMENT labels (#PCDATA)>
<!ATTLIST labels
count CDATA #REQUIRED
>
<!ELEMENT param (description?, labels?)>
<!ATTLIST param
name CDATA #REQUIRED
default CDATA #IMPLIED
min CDATA #IMPLIED
max CDATA #IMPLIED
step CDATA #IMPLIED
optional (true|false) 'false'
const (true|false) 'false'
type (bool | boolean | int | obs | scalar | series | list |
matrix | bundle | scalarref | seriesref | matrixref |
bundleref | string | strings | matrices | bundles |
stringsref | matricesref | bundlesref) 'series'
>
<!ELEMENT return EMPTY>
<!ATTLIST return
name CDATA #REQUIRED
type (scalar | series | matrix | list | string | bundle |
strings | matrices | bundles) 'series'
>
<!ATTLIST sample-script
filename CDATA #IMPLIED
>
<!ELEMENT sample-script (#PCDATA)>
<!ELEMENT code (#PCDATA)>
|