FIXME: write docs

Generate a retrograde primary navigation link with this `content` to this
`url`, indicating a backward move through the appliication.

Generate a primary navigation link with this `content` to this `url`.
TODO: should be renamed. `primary-link` would be better.

Compose an auxiliary list from this `auxlist` specification of dependent
records (i.e. the far side of a
one-to-many link) of the record of this `entity` within this `application`
being edited in this `form` 

Generate all auxiliary lists required for this `form` of this `entity`
within this `application`.

Compose the content for this `form` of this `entity` within this `application`.

Compose any extra-head declarations (i.e. special Javascript tags) required
for this `form` of this `entity` within this `application`.

Compose any extra-tail declarations (i.e. special Javascript tags) required
for this `form` of this `entity` within this `application`.

Generate an appropriate `ifmemberof` tag (see `adl-support.tags`) given this
`privilege` for the  ADL elements listed in `elts`, which may be fields,
properties, list, forms, pages or entities.

Generate an input widget for this `field-or-property` of this `form` for
this `entity` taken from within this `application`, in context of a para
also containing its label.

Compose a list search widget for this `field` referencing a property within
this `entity`.

Compose content to emit if the user is not authorised to write, or
not authorised to read, property `p` in form, list or page `f` of
entity `e` within application `a`, while generating a widget with id
`w`.

Compose a widget paragraph for property `p` in form, list or page `f` of
entity `e` within application `a`, with id `w` and this `content`.

For the present, just return the standard cross site scripting protection
field statement

Return an appropriate 'save' widget for this `form` operating on this
`entity` taken from this `application`.

FIXME: write docs

Return the content of the file at `resource-path`, with these
`substitutions` made into it in order. Substitutions should be pairs
[`pattern` `value`], where `pattern` is a string, a char, or a regular
expression.

FIXME: write docs

FIXME: write docs

FIXME: write docs

Generate one or more templates for editing instances of this
`entity` in this `application`

Generate a footer for a template file with this `filename` for this `spec`
of this `entity` within this `application`.

Generate a header for a template file with this `filename` for this `spec`
of this `entity` within this `application`.

Generate a template as specified by this `form` element for this `entity`,
taken from this `application`. If `form` is nill, generate a default form
template for the entity.

Produce template code to get options for this `property` of this `entity`
taken from this `application`.

Return, as an integer, the fieldwidth for the input widget for this
`property`.

Return a table body element for the list view for this `list-spec` of
this `entity` within this `application`, using data from this `source`.

Generate a template as specified by this `list` element for this `entity`,
taken from this `application`. If `list` is nill, generate a default list
template for the entity.

Generate a template as specified by this `page` element for this `entity`,
taken from this `application`. If `page` is nil, generate a default page
template for the entity.

TODO: not yet written.

Return an appropriate 'save' widget for this `form` operating on this
`entity` taken from this `application`.
TODO: should be suppressed unless a member of a group which can insert
or edit.

FIXME: write docs

Return the property on which we will by default do a user search on this
`entity`.

Generate an HTML `SELECT` widget for this `property` of this `entity` within
this `application`, to be used in this `form`. TODO: Many selectable things
are potentially too numerous to be simply represented in a simple static
SELECT, it needs some asynchronous fetching. See
[issue 47](https://github.com/simon-brooke/youyesyet/issues/47).

Generate all [Selmer](https://github.com/yogthos/Selmer) templates implied
by this ADL `application` spec.

Generate a widget for this `field-or-property` of this `form` for this
`entity` taken from within this `application`, in context of a para also
containing its label.

Return an appropriate HTML5 input type for this property.

Wrap this `content` in an if-member-of tag; if `writeable?` is true,
allow those groups by whom it is writeable, else those by whom it is
readable. `context` should be a sequence of adl elements from which
permissions may be obtained.

Write a template file with this `filename` from this `template` in the
context of this `application`.