### Install STEPutils from Source

Source: https://github.com/mozman/steputils/blob/master/README.md

Install STEPutils by cloning the repository and running the setup script.

```bash
python setup.py install
```

--------------------------------

### Install STEPutils with pip

Source: https://github.com/mozman/steputils/blob/master/README.md

Install the STEPutils package using pip for Python 3.7 and later.

```bash
pip install steputils
```

--------------------------------

### Install Development Version from GitHub

Source: https://github.com/mozman/steputils/blob/master/README.md

Install the latest development version of STEPutils directly from GitHub using pip.

```bash
pip install git+https://github.com/mozman/steputils.git@master
```

--------------------------------

### get

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Retrieves an EntityInstance by its reference name, returning None if not found. Searches all data sections if multiple exist.

```APIDOC
## get(ref: Reference)

### Description
Returns `EntityInstance` by instance name ref or `None` if not found. Searches all data sections if more than one exist.

### Parameters
* **ref** (Reference) - Required - entity instance name as string e.g. `'#100'`

### Returns
EntityInstance | None
```

--------------------------------

### steputils.p21.reference

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Factory function to create a new Reference object, representing an Entity Instance Name. References must start with '#' followed by digits.

```APIDOC
## steputils.p21.reference

### Description
Factory function to create a new [`Reference`](#steputils.p21.Reference) object (Entity Instance Name).
A reference has to start with `'#'` followed by only digits e.g. `'#100'`
```

--------------------------------

### Getting Data Section Instance by Reference

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Safely retrieve an entity instance by its reference string, returning None if not found.

```python
data_section.get('#100')
```

--------------------------------

### steputils.p21.keyword

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Factory function to create a new Keyword object. Keywords must consist of uppercase letters and digits, starting with an uppercase letter for standard keywords or '!' for user-defined keywords.

```APIDOC
## steputils.p21.keyword

### Description
Factory function to create a new [`Keyword`](#steputils.p21.Keyword) object. Only uppercase letters
and digits are allowed, standard keyword has to start with an uppercase letter and
user defined keyword has to start with `'!'`.
```

--------------------------------

### Retrieving References from Data Section

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Get an iterable of all entity instance names (references) present in the data section.

```python
data_section.references()
```

--------------------------------

### Getting Data Section Instance Count

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Determine the total number of entity instances stored within a data section.

```python
len(data_section)
```

--------------------------------

### Get the root node of the model

Source: https://github.com/mozman/steputils/blob/master/TODO.md

Retrieves the root node of the STEP model. This node serves as the entry point for navigating the model's structure.

```python
root = ifc4.get_root()
```

--------------------------------

### Create, Write, and Read STEP File

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Demonstrates the complete workflow of creating a new STEP file, adding data, setting header information, saving it to disk, and then reading it back. Includes error handling for file I/O and parsing.

```python
from steputils import p21

FNAME = "example.p21"

# Create a new STEP-file:
stepfile = p21.new_step_file()

# Create a new data section:
data = stepfile.new_data_section()

# Add entity instances to data section:
data.add(p21.simple_instance('#1', name='APPLICATION', params=('MyApp', 'v1.0')))

# Set required header entities:
stepfile.header.set_file_description(('Example STEP file', 'v1.0'))
stepfile.header.set_file_name(name=FNAME, organization=('me', 'myself'), authorization='me')
# A file schema has to be defined explicit, list all used file schemas.
stepfile.header.set_file_schema(('NONE',))

# Write STEP-file to file system:
stepfile.save(FNAME)

# Read an existing file from file system:
try:
    stepfile = p21.readfile(FNAME)
except IOError as e:
    print(str(e))
except p21.ParseError as e:
    # Invalid STEP-file or unsupported version
    print(str(e))
else:
    print(f'File {FNAME} is a valid STEP-file (ISO 10303-21;2002).')
```

--------------------------------

### save

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Exports the STEP-file to the file system with the specified name.

```APIDOC
## save(name: str)

### Description
Export STEP-file to the file system.

### Parameters
* **name** (str) - Required - The name of the file to save.
```

--------------------------------

### Creating a New Data Section

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Instantiate a new STEP-file with at least one data section using the factory function.

```python
stepfile = StepFile.new_data_section()
```

--------------------------------

### Create a new IFC4 model instance

Source: https://github.com/mozman/steputils/blob/master/TODO.md

Instantiates a new model for the IFC4 schema. This is the first step in creating or loading STEP model data.

```python
ifc4 = steputils.model('IFC4')
```

--------------------------------

### steputils.p21.new_step_file

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Factory function to create a new, empty StepFile object, ready for populating with data.

```APIDOC
## steputils.p21.new_step_file

### Description
Factory function to create a new [`StepFile`](#steputils.p21.StepFile) object.

### Method
new_step_file

### Response
#### Success Response (StepFile)
Returns a new, empty `StepFile` object.
```

--------------------------------

### Setting File Schema

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Define the schema used for the STEP file. Accepts an iterable of schema names.

```python
header.set_file_schema(['AP203', 'ISO-10303-21'])
```

--------------------------------

### Setting File Description

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Set the file description, typically a tuple of strings. The level parameter controls the description level.

```python
header.set_file_description(description=('Example Description',))
```

--------------------------------

### write

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Serializes the data to a STEP-file (ISO 10303-21) formatted stream to the provided file pointer. Uses 'iso-8859-1' encoding, compatible with 'ascii'.

```APIDOC
## write(fp: TextIO)

### Description
Serialize to a STEP-file (ISO 10303-21) formatted stream to `fp` (a [`write()`](#steputils.p21.StepFile.write)-supporting file-like object). File encoding should be `'iso-8859-1'` but can also be `'ascii'`, because ISO 10303-21 requires special encoding for characters > 126 into characters < 127 as unicode compatible characters, which should be compatible with most encodings, but don’t use 16-bit encodings!

### Parameters
* **fp** (TextIO) - Required - text stream
```

--------------------------------

### steputils.p21.parameter_list

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Factory function to create a new ParameterList object.

```APIDOC
## steputils.p21.parameter_list

### Description
Factory function to create a new [`ParameterList`](#steputils.p21.ParameterList) object.
```

--------------------------------

### Setting File Name

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Set the file name and associated metadata such as timestamp, author, and organization.

```python
header.set_file_name(name='example.step', time_stamp='2023-01-01T12:00:00Z', author='John Doe')
```

--------------------------------

### steputils.p21.loads

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Loads a STEP-file (ISO 10303-21:2002) directly from a unicode string. It decodes special characters according to the standard.

```APIDOC
## steputils.p21.loads

### Description
Loads a STEP-file (ISO 10303-21:2002) from a unicode string. Decoding for special characters greater than 126 to unicode characters is applied according to the ISO 10303-21:2002 standard.

### Method
loads

### Parameters
#### Request Body
- **s** (str) - Required - The STEP-file content as a unicode string.

### Response
#### Success Response (StepFile)
Returns a `StepFile` object representing the content of the STEP-file.
```

--------------------------------

### steputils.p21.simple_instance

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Factory function to create a new SimpleEntityInstance object, automatically creating the underlying Entity object.

```APIDOC
## steputils.p21.simple_instance

### Description
Factory function to create a new [`SimpleEntityInstance`](#steputils.p21.SimpleEntityInstance) object. This method automatically creates the [`Entity`](#steputils.p21.Entity) object.

### Method
simple_instance

### Parameters
#### Request Body
- **ref** (str or Reference) - Required - The instance reference.
- **name** (str or Keyword) - Required - The entity name.
- **params** (tuple, list, or ParameterList) - Required - The entity parameters.
```

--------------------------------

### Create a new entity instance

Source: https://github.com/mozman/steputils/blob/master/TODO.md

Creates a new entity instance within the model, such as 'IfcRoot'. Requires a unique identifier and can accept additional arguments.

```python
entity = ifc4.entity('IfcRoot', IfcGloballyUniqueId=guid())
```

--------------------------------

### steputils.p21.load

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Loads a STEP-file (ISO 10303-21:2002) from a text stream. It handles special character encoding and supports reading files as 'ascii'.

```APIDOC
## steputils.p21.load

### Description
Loads a STEP-file (ISO 10303-21:2002) from a text stream. Special encoding for characters greater than 126 is applied, and reading as 'ascii' is generally sufficient.

### Method
load

### Parameters
#### Request Body
- **fp** (TextIO) - Required - The STEP-file content as a text stream yielding unicode strings.

### Response
#### Success Response (StepFile)
Returns a `StepFile` object representing the content of the STEP-file.

### Notes
ISO 10303-21:2016 files are not supported. UTF-8 encoding can be used for older STEP-files as code points less than 127 are compatible with 'ISO-8859-1' or default 'ascii'.
```

--------------------------------

### steputils.p21.binary

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Factory function to create a new Binary object. This is primarily for export, with 'unset' specifying the uppermost unset bits.

```APIDOC
## steputils.p21.binary

### Description
Factory function to create a new [`Binary`](#steputils.p21.Binary) object. Only for export used,
unset specifies the uppermost unset bits.
```

--------------------------------

### steputils.p21.readfile

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Reads a STEP-file (ISO 10303-21:2002) from the file system. It handles potential IOErrors and ParseErrors for invalid or unsupported STEP-file formats.

```APIDOC
## steputils.p21.readfile

### Description
Reads a STEP-file (ISO 10303-21:2002) from the file system.

### Method
readfile

### Parameters
#### Path Parameters
- **filename** (str) - Required - The path to the STEP-file to read.

### Response
#### Success Response (StepFile)
Returns a `StepFile` object representing the content of the STEP-file.

#### Error Response
- **IOError**: If there is an issue reading the file.
- **p21.ParseError**: If the file is not a valid STEP-file or uses an unsupported version.
```

--------------------------------

### __getitem__

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Retrieves an EntityInstance by its reference name. It searches across all available data sections if multiple exist.

```APIDOC
## __getitem__(ref: Reference)

### Description
Returns `EntityInstance` by instance name ref. Searches all data sections if more than one exist.

### Parameters
* **ref** (Reference) - Required - entity instance name as string e.g. `'#100'`

### Raises
**KeyError** – instance id not found
```

--------------------------------

### __str__

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Serializes the data to a STEP-file (ISO 10303-21) formatted string, applying special encoding for characters greater than 126.

```APIDOC
## __str__()

### Description
Serialize to a STEP-file (ISO 10303-21) formatted `str`. Special encoding for characters > 126 into characters < 127 as unicode compatible characters according to ISO 10303-21 standard will be applied.

### Returns
str
```

--------------------------------

### DataSection Methods

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Provides an overview of the methods available for interacting with a DataSection, including accessing instances, parameters, and references.

```APIDOC
## DataSection Class

### Description
Represents a section of application data in a STEP-21 file. It holds entity instances and associated parameters.

### Methods

#### `__getitem__(ref: str) -> EntityInstance`
Returns an entity instance by its reference string. Raises `KeyError` if the instance is not found.

#### `__iter__() -> Iterable[EntityInstance]`
Returns an iterable of all entity instances within this data section.

#### `get(ref: str) -> EntityInstance | None`
Returns an entity instance by its reference string, or `None` if not found.

#### `__len__() -> int`
Returns the total number of entity instances in this data section.

#### `references() -> Iterable[str]`
Returns an iterable of all entity instance reference names (e.g., '#100') in this data section.

#### `parameter`
Attribute that holds parameters associated with this data section.

#### `instances`
Ordered dictionary of all entity instances in this data section. Keys are instance names (e.g., `'#100'`), and values are `EntityInstance` objects.
```

--------------------------------

### add

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Appends a new entity instance to the collection. If an instance with the same name already exists, it will be replaced.

```APIDOC
## add

### Description
Appends a new entity instance. Replaces existing instances with the same instance name if already exists.

### Method
`add`

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
* **instance** (EntityInstance) - Required - The entity instance to append.

### Request Example
```json
{
  "example": "instance: EntityInstance"
}
```

### Response
#### Success Response (200)
None

#### Response Example
None
```

--------------------------------

### steputils.p21.simple_entity_instance

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Factory function to create a new SimpleEntityInstance object using a provided Entity object.

```APIDOC
## steputils.p21.simple_entity_instance

### Description
Factory function to create a new [`SimpleEntityInstance`](#steputils.p21.SimpleEntityInstance) object using a provided [`Entity`](#steputils.p21.Entity) object.

### Method
simple_entity_instance

### Parameters
#### Request Body
- **ref** (str or Reference) - Required - The instance reference.
- **entity** (Entity) - Required - The entity object.
```

--------------------------------

### Adding Header Entries

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Add or replace an entry in the header. The entity must be of type Entity.

```python
header.add(entity)
```

--------------------------------

### steputils.p21.timestamp

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Factory function that returns an ISO formatted UTC timestamp.

```APIDOC
## steputils.p21.timestamp

### Description
Factory function returns an ISO formatted UTC timestamp.
```

--------------------------------

### steputils.p21.entity

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Factory function to create a new Entity object. It takes an entity name and its parameters.

```APIDOC
## steputils.p21.entity

### Description
Factory function to create a new [`Entity`](#steputils.p21.Entity) object.

### Parameters
* **name** – entity name as str or [`Keyword`](#steputils.p21.Keyword) object
* **params** – entity parameters as `tuple`, `list` or [`ParameterList`](#steputils.p21.ParameterList)
```

--------------------------------

### Find All Matching Child Elements

Source: https://github.com/mozman/steputils/blob/master/TODO.md

Use `findall` to retrieve all child elements that match the specified tag name.

```python
root.findall('spam')  # finds all matching child elements named spam
```

--------------------------------

### Accessing Data Section Instances

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Retrieve an entity instance from a data section using its reference string (e.g., '#100'). Raises KeyError if not found.

```python
data_section.__getitem__('#100')
```

--------------------------------

### Accessing Header Entries

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Retrieve a header entry by its name. Returns None if the entry is not found.

```python
header.get('FILE_DESCRIPTION')
```

--------------------------------

### __len__

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Returns the total count of all stored entity instances.

```APIDOC
## __len__()

### Description
Returns count of all stored entity instances.

### Returns
int
```

--------------------------------

### Find First Matching Child Element

Source: https://github.com/mozman/steputils/blob/master/TODO.md

Use `find` to retrieve the first child element that matches the specified tag name.

```python
root.find('spam')  # find first matching child element named spam
```

--------------------------------

### __iter__

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Returns an iterable of all instance entities across all data sections.

```APIDOC
## __iter__()

### Description
Returns iterable of all instance entities of all data sections.

### Returns
Iterable[EntityInstance]
```

--------------------------------

### new_data_section

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Creates and appends a new DataSection to the existing data sections. The schema name must be present in the file_schema entry of the header.

```APIDOC
## new_data_section(params: Iterable = None)

### Description
Create a new [`DataSection`](#steputils.p21.DataSection) and append to existing data sections. The schema name must appear in the header section file_schema entry.

### Parameters
* **name** (str) - Optional - name of data section
* **schema** (str) - Optional - schema of data section

### Returns
[DataSection](#steputils.p21.DataSection)
```

--------------------------------

### Iterating Through Data Section Instances

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Obtain an iterable of all entity instances within a data section.

```python
for instance in data_section:
    pass
```

--------------------------------

### steputils.p21.complex_entity_instance

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Factory function to create a new ComplexEntityInstance object. It takes an instance reference and a list of Entity objects.

```APIDOC
## steputils.p21.complex_entity_instance

### Description
Factory function to create a new [`ComplexEntityInstance`](#steputils.p21.ComplexEntityInstance) object.

### Parameters
* **ref** – instance reference as `str` or [`Reference`](#steputils.p21.Reference) object.
* **entities** – list of [`Entity`](#steputils.p21.Entity) objects.
```

--------------------------------

### append

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Appends a new data section to the existing data.

```APIDOC
## append(data: DataSection)

### Description
Append new data section data.

### Parameters
* **data** (DataSection) - Required - data section
```

--------------------------------

### steputils.p21.enum

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Factory function to create a new Enumeration object. Enumerations are enclosed in '.' and contain only uppercase letters and digits.

```APIDOC
## steputils.p21.enum

### Description
Factory function to create a new [`Enumeration`](#steputils.p21.Enumeration) object. An enumeration is
surrounded `'.'` and only uppercase letters and digits are allowed
e.g. `'.TRUE.'` or `'.FALSE.'`.
```

--------------------------------

### steputils.p21.typed_parameter

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Factory function to create a new TypedParameter object. It requires a type name and the parameter value.

```APIDOC
## steputils.p21.typed_parameter

### Description
Factory function to create a new [`TypedParameter`](#steputils.p21.TypedParameter) object.

### Parameters
* **type_name** – type name as `str` or [`Keyword`](#steputils.p21.Keyword) object.
* **param** – typed parameter
```

--------------------------------

### steputils.p21.is_binary

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Type checker function that returns True if the input is a Binary object.

```APIDOC
## steputils.p21.is_binary

### Description
Returns `True` if e is a [`Binary`](#steputils.p21.Binary).
```

--------------------------------

### steputils.p21.is_simple_entity_instance

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Type checker function that returns True if the input is a SimpleEntityInstance object.

```APIDOC
## steputils.p21.is_simple_entity_instance

### Description
Returns `True` if e is a [`SimpleEntityInstance`](#steputils.p21.SimpleEntityInstance).
```

--------------------------------

### Iterate over child nodes

Source: https://github.com/mozman/steputils/blob/master/TODO.md

Provides a way to loop through all child nodes of a given parent node in the DOM.

```python
for entity in root:
    pass
```

--------------------------------

### steputils.p21.is_reference

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Type checker function that returns True if the input is an EntityInstanceName.

```APIDOC
## steputils.p21.is_reference

### Description
Returns `True` if e is an `EntityInstanceName`.
```

--------------------------------

### steputils.p21.is_string

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Type checker function that returns True if the input is a string.

```APIDOC
## steputils.p21.is_string

### Description
Returns `True` if e is a `str`.
```

--------------------------------

### Insert a child node at a specific index

Source: https://github.com/mozman/steputils/blob/master/TODO.md

Inserts a new entity node as a child to a specified parent node at a given index in the DOM.

```python
root.insert(index, entity)
```

--------------------------------

### __delitem__

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Deletes an entity instance from all data sections using its reference name.

```APIDOC
## __delitem__(ref: Reference)

### Description
Deletes entity instance by instance name ref from all data sections.

### Parameters
* **ref** (Reference) - Required - entity instance name as string e.g. `'#100'`

### Raises
**KeyError** – instance ref not found
```

--------------------------------

### Add multiple child nodes to a parent

Source: https://github.com/mozman/steputils/blob/master/TODO.md

Appends multiple new entity nodes as children to a specified parent node in the DOM.

```python
root.extend([entity, entity2, ...])
```

--------------------------------

### steputils.p21.is_keyword

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Type checker function that returns True if the input is a Keyword object.

```APIDOC
## steputils.p21.is_keyword

### Description
Returns `True` if e is a [`Keyword`](#steputils.p21.Keyword).
```

--------------------------------

### has_reference

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Checks if a given reference exists in any of the data sections.

```APIDOC
## has_reference(ref: str)

### Description
Returns True if reference ref exist in any data section.

### Parameters
* **ref** (str) - Required - The reference to check.

### Returns
bool
```

--------------------------------

### steputils.p21.unset_parameter

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Factory function to create a new UnsetParameter object. Unset attribute values are represented by '$', and explicit attributes re-declared as derived in a subtype are encoded as '*'.

```APIDOC
## steputils.p21.unset_parameter

### Description
Factory function to create a new [`UnsetParameter`](#steputils.p21.UnsetParameter) object. Unset attribute
values are given as `'$'`. Explicit attributes which got re-declared as derived in
a subtype are encoded as `'*'` in the position of the supertype attribute.
```

--------------------------------

### steputils.p21.is_integer

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Type checker function that returns True if the input is an integer.

```APIDOC
## steputils.p21.is_integer

### Description
Returns `True` if e is an `int`.
```

--------------------------------

### steputils.p21.is_real

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Type checker function that returns True if the input is a float.

```APIDOC
## steputils.p21.is_real

### Description
Returns `True` if e is a `float`.
```

--------------------------------

### steputils.p21.is_parameter_list

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Type checker function that returns True if the input is a ParameterList object. A single parameter is indicated if it's not a ParameterList.

```APIDOC
## steputils.p21.is_parameter_list

### Description
Returns `True` if e is a [`ParameterList`](#steputils.p21.ParameterList).
Note: It is a single parameter if it’s not a [`ParameterList`](#steputils.p21.ParameterList)
```

--------------------------------

### steputils.p21.is_unset_parameter

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Type checker function that returns True if the input is an unset or omitted parameter.

```APIDOC
## steputils.p21.is_unset_parameter

### Description
Returns `True` if e is an unset or omitted parameter ([`UnsetParameter`](#steputils.p21.UnsetParameter)).
```

--------------------------------

### Add a single child node to a parent

Source: https://github.com/mozman/steputils/blob/master/TODO.md

Appends a single new entity node as a child to a specified parent node in the DOM.

```python
root.append(entity)
```

--------------------------------

### steputils.p21.is_complex_entity_instance

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Type checker function that returns True if the input is a ComplexEntityInstance object.

```APIDOC
## steputils.p21.is_complex_entity_instance

### Description
Returns `True` if e is a [`ComplexEntityInstance`](#steputils.p21.ComplexEntityInstance).
```

--------------------------------

### steputils.p21.is_entity

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Type checker function that returns True if the input is an Entity object.

```APIDOC
## steputils.p21.is_entity

### Description
Returns `True` if e is a [`Entity`](#steputils.p21.Entity).
```

--------------------------------

### steputils.p21.is_typed_parameter

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Type checker function that returns True if the input is a TypedParameter object.

```APIDOC
## steputils.p21.is_typed_parameter

### Description
Returns `True` if e is a [`TypedParameter`](#steputils.p21.TypedParameter).
```

--------------------------------

### steputils.p21.is_enum

Source: https://github.com/mozman/steputils/blob/master/docs/source/p21.md

Type checker function that returns True if the input is an Enumeration object.

```APIDOC
## steputils.p21.is_enum

### Description
Returns `True` if e is an [`Enumeration`](#steputils.p21.Enumeration).
```

--------------------------------

### Remove a child node from a parent

Source: https://github.com/mozman/steputils/blob/master/TODO.md

Removes a specified child node from its parent node in the DOM.

```python
root.remove(entity)
```

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