a:ln (Line Properties)

Describes the line-formatting structure used by a:ln in DrawingML shape outlines..

Parent elements

a:spPr

Child elements

(none)

Description

a:ln is a DrawingML or SVG namespace element used to describe a specific part of a shape, text run, theme, or graphic. In the ECMA-376 DrawingML model, it participates in the XML content tree that defines visual appearance, geometry, and formatting for OOXML content.

The element is commonly encountered in presentation, document, and spreadsheet packages where shapes, charts, pictures, or text boxes are serialized as Open XML. The examples below illustrate a typical usage pattern and a corresponding Open XML SDK implementation.

Attributes

Attribute	Type	Possible Values	Description
`w`	ST_LineWidth	integer	Line width in EMUs.
`cap`	ST_LineCap	flat, round, square	Line end cap.
`cmpd`	ST_CompoundLine	sng, dbl, thr	Compound line style.
`algn`	ST_PenAlignment	ctr, ln	Alignment of the line around the center.

XML Example

<a:ln w="12700" cap="flat" cmpd="sng" algn="ctr">
  <a:solidFill><a:srgbClr val="000000"/></a:solidFill>
</a:ln>

using DocumentFormat.OpenXml.Drawing;

var line = new LineProperties
{
    Width = 12700,
    Cap = LineCapValues.Flat,
    CompoundLine = CompoundLineValues.Single,
    Alignment = PenAlignmentValues.Center
};
line.Append(new SolidFill(
    new RgbColorModelHex { Val = "000000" }
));

Notes

The permitted child elements and attribute values depend on the surrounding OOXML part and the schema version in use.
In practice, DrawingML content is usually generated from higher-level shape or picture APIs rather than built manually element-by-element.
When this element appears inside a document package, it is typically linked by relationships or contained in a drawing part that is referenced from a shape or graphic object.